24 Questions
What is the unit of measurement for perimeter?
mm, cm, m, or km
What is the formula to calculate the perimeter of a rectangle?
P = 2 × length + 2 × width
What is the perimeter of a circle called?
Circumference
What is the definition of a square?
A flat two-dimensional shape with all four sides equal in length, and all adjacent sides at right angles (90°) to each other.
What is the formula to calculate the perimeter of a circle?
C = 2 × π × radius
What is the unit of measurement for area?
mm², cm², m², or km²
What is the definition of a rectangle?
A flat two-dimensional shape with both pairs of opposite sides equal in length, and all adjacent sides at right angles (90°) to each other.
What is the formula to calculate the perimeter of a triangle?
P = side₁ + side₂ + side₃
What is the total length of the outside of a shape?
Perimeter
How is the perimeter of a circle measured?
Using a piece of string placed along the outline of the circle
What is the formula to calculate the perimeter of a square?
P = 4 × side
What is the length from the centre to any point on the edge of a circle?
Radius
What is the size of a surface or plane?
Area
What is the unit of measurement for the area of a shape?
mm², cm², m², or km²
What is the distance around the curved edge of a circle?
Circumference
What is the formula to calculate the perimeter of a triangle?
P = side_1 + side_2 + side_3
What is the purpose of using a piece of string to measure the perimeter of a circle?
To estimate the circumference of the circle
Which of the following shapes has a perimeter that can be calculated using the formula P = 4 × side?
Square
What is the name of the special mathematical constant used in the formula to calculate the perimeter of a circle?
π
What is the unit of measurement for the perimeter of a shape?
mm, cm, m, or km
What is the name of the line that forms the boundary of a closed geometric figure?
Perimeter
Which of the following formulas is used to calculate the perimeter of a triangle?
P = side₁ + side₂ + side₃
What is the definition of the diameter of a circle?
The length from one edge of the circle to the other, passing through the centre
What is the definition of the area of a shape?
The amount of space inside the boundary of a flat object
Study Notes
Measuring Perimeter
- Perimeter is the total length of the outside of a shape or the continuous line forming the boundary of a closed geometric figure.
- Perimeter is measured in units such as mm, cm, m, or km.
- To measure the perimeter of a rectangle, square, or triangle, measure the length of each side using a ruler and add the sides to get the perimeter.
- To measure the perimeter of a circle (circumference), use a piece of string placed along the outline of the circle, then measure the string length on a ruler to estimate the perimeter.
Shape Definitions
- A rectangle is a flat two-dimensional shape with both pairs of opposite sides equal in length and all adjacent sides at right angles (90°) to each other.
- A square is a flat, two-dimensional shape with all four sides equal in length, and all adjacent sides at right angles (90°) to each other.
- The circumference of a circle is the perimeter of a circle or the distance around the curved edge of a circle.
Formulae to Calculate Perimeter
- Perimeter of a rectangle: P = 2 × length + 2 × width
- Perimeter of a square: P = 4 × side
- Perimeter of a triangle: P = side₁ + side₂ + side₃
- Circumference of a circle: C = π × diameter or C = 2 × π × radius
Circle Definitions
- Radius (r) is the length from the centre to any point on the edge of the circle.
- Diameter (d) is the length from one edge of the circle to the other, passing through the centre.
- Pi (π) is a special mathematical constant approximately equal to 3.142.
Measuring Area
- Area is the size of a surface or plane or the amount of space inside the boundary of a flat (2-dimensional) object such as a square, triangle, or circle.
- Area is measured in units such as mm², cm², m², or km².
Estimating Area
- One way to estimate the area without using formulae is to place a square grid over the area and count how many squares fit within the shape.
Formulae to Calculate Area
- Area of a rectangle: A = length × width
- Area of a square: A = side × side = side²
- Area of a triangle: A = (1/2) × base × height
- Area of a circle: A = π × radius²
Perpendicular Definition
- A perpendicular line is a straight line that lies at an angle of 90° to a given line, plane, or surface.
Measuring Perimeter
- Perimeter is the total length of the outside of a shape or the continuous line forming the boundary of a closed geometric figure.
- Perimeter is measured in units such as mm, cm, m, or km.
- To measure the perimeter of a rectangle, square, or triangle, measure the length of each side using a ruler and add the sides to get the perimeter.
- To measure the perimeter of a circle (circumference), use a piece of string placed along the outline of the circle, then measure the string length on a ruler to estimate the perimeter.
Shape Definitions
- A rectangle is a flat two-dimensional shape with both pairs of opposite sides equal in length and all adjacent sides at right angles (90°) to each other.
- A square is a flat, two-dimensional shape with all four sides equal in length, and all adjacent sides at right angles (90°) to each other.
- The circumference of a circle is the perimeter of a circle or the distance around the curved edge of a circle.
Formulae to Calculate Perimeter
- Perimeter of a rectangle: P = 2 × length + 2 × width
- Perimeter of a square: P = 4 × side
- Perimeter of a triangle: P = side₁ + side₂ + side₃
- Circumference of a circle: C = π × diameter or C = 2 × π × radius
Circle Definitions
- Radius (r) is the length from the centre to any point on the edge of the circle.
- Diameter (d) is the length from one edge of the circle to the other, passing through the centre.
- Pi (π) is a special mathematical constant approximately equal to 3.142.
Measuring Area
- Area is the size of a surface or plane or the amount of space inside the boundary of a flat (2-dimensional) object such as a square, triangle, or circle.
- Area is measured in units such as mm², cm², m², or km².
Estimating Area
- One way to estimate the area without using formulae is to place a square grid over the area and count how many squares fit within the shape.
Formulae to Calculate Area
- Area of a rectangle: A = length × width
- Area of a square: A = side × side = side²
- Area of a triangle: A = (1/2) × base × height
- Area of a circle: A = π × radius²
Perpendicular Definition
- A perpendicular line is a straight line that lies at an angle of 90° to a given line, plane, or surface.
Measuring Perimeter
- Perimeter is the total length of the outside of a shape or the continuous line forming the boundary of a closed geometric figure.
- Perimeter is measured in units such as mm, cm, m, or km.
- To measure the perimeter of a rectangle, square, or triangle, measure the length of each side using a ruler and add the sides to get the perimeter.
- To measure the perimeter of a circle (circumference), use a piece of string placed along the outline of the circle, then measure the string length on a ruler to estimate the perimeter.
Shape Definitions
- A rectangle is a flat two-dimensional shape with both pairs of opposite sides equal in length and all adjacent sides at right angles (90°) to each other.
- A square is a flat, two-dimensional shape with all four sides equal in length, and all adjacent sides at right angles (90°) to each other.
- The circumference of a circle is the perimeter of a circle or the distance around the curved edge of a circle.
Formulae to Calculate Perimeter
- Perimeter of a rectangle: P = 2 × length + 2 × width
- Perimeter of a square: P = 4 × side
- Perimeter of a triangle: P = side₁ + side₂ + side₃
- Circumference of a circle: C = π × diameter or C = 2 × π × radius
Circle Definitions
- Radius (r) is the length from the centre to any point on the edge of the circle.
- Diameter (d) is the length from one edge of the circle to the other, passing through the centre.
- Pi (π) is a special mathematical constant approximately equal to 3.142.
Measuring Area
- Area is the size of a surface or plane or the amount of space inside the boundary of a flat (2-dimensional) object such as a square, triangle, or circle.
- Area is measured in units such as mm², cm², m², or km².
Estimating Area
- One way to estimate the area without using formulae is to place a square grid over the area and count how many squares fit within the shape.
Formulae to Calculate Area
- Area of a rectangle: A = length × width
- Area of a square: A = side × side = side²
- Area of a triangle: A = (1/2) × base × height
- Area of a circle: A = π × radius²
Perpendicular Definition
- A perpendicular line is a straight line that lies at an angle of 90° to a given line, plane, or surface.
Learn about measuring the perimeter of various shapes, including rectangles, squares, triangles, and circles. Understand the concept of perimeter and how to calculate it using a ruler or string.
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