Mensuration: Area and Perimeter of 2D Shapes
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Questions and Answers

The volume of a cone with base radius $r$ and perpendicular height $h$ is given by $\frac{1}{3}\pi r^2 l$, where $l$ is the slant height.

False (B)

If a square pyramid has a base side of length $a$ and a slant height of $l$, then its total surface area is given by $a^2 + 4al$.

False (B)

If the side of a square is doubled, its area also doubles.

False (B)

The curved surface area of a cylinder with base radius $r$ and perpendicular height $h$ is $2\pi r(r+h)$.

<p>False (B)</p> Signup and view all the answers

If the sides of a triangle are $a = 5$, $b = 6$, and $c = 7$, then, using Heron's formula, its area is $6\sqrt{6}$ square units.

<p>True (A)</p> Signup and view all the answers

A rectangle with a length of 5cm and a width of 3cm has the same perimeter as a rectangle with a length of 6cm and a width of 2cm.

<p>True (A)</p> Signup and view all the answers

To convert from cubic meters ($m^3$) to liters (L), you should use the conversion factor 1 $m^3$ = 100 L.

<p>False (B)</p> Signup and view all the answers

If the radius of a circle is increased by a factor of 3, the area increases by a factor of 6.

<p>False (B)</p> Signup and view all the answers

In a parallelogram, if the base is halved and the height is doubled, the area remains unchanged.

<p>True (A)</p> Signup and view all the answers

The total surface area of a cone with radius $r$ and slant height $l$ is $\pi r (l + r)$, this includes the base.

<p>True (A)</p> Signup and view all the answers

The volume of a cuboid with length $l$, width $w$, and height $h$ is given by $2(lw + wh + lh)$.

<p>False (B)</p> Signup and view all the answers

The volume of a cube with side length 's' is numerically equal to its surface area when $s = 6$.

<p>True (A)</p> Signup and view all the answers

The surface area of a sphere with radius $r$ is equal to the curved surface area of a cylinder with radius $r$ and height $2r$.

<p>True (A)</p> Signup and view all the answers

Doubling all the dimensions of a cuboid will result in doubling its volume.

<p>False (B)</p> Signup and view all the answers

If two cylinders have the same radius but different heights, the cylinder with the greater height will always have the larger curved surface area.

<p>True (A)</p> Signup and view all the answers

A cone and a cylinder have the same base radius and height, the volume of the cone is one-quarter the volume of the cylinder.

<p>False (B)</p> Signup and view all the answers

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Flashcards

What is Mensuration?

Deals with measuring geometric shapes, areas, and volumes.

What is Area?

The measure of the surface enclosed by a 2D shape.

What is Perimeter?

Total length of the boundary of a 2D shape.

What is a Square?

A quadrilateral with four equal sides and four right angles. Area = s², Perimeter = 4s

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What is a Rectangle?

Quadrilateral with opposite sides equal and four right angles. Area = l * w, Perimeter = 2(l + w)

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What is a Triangle?

A three-sided polygon. Area = (1/2) * b * h

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What is a Circle?

Points equidistant from a center. Area = πr², Circumference = 2πr

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What is Volume?

Measure of space occupied by a 3D shape.

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Cone Volume Formula

Volume of a cone is one-third times pi times radius squared, times height

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Cone Curved Surface Area

Curved surface area of a cone is pi times radius times slant height.

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Cone Total Surface Area

Total surface area is pi times radius, times radius plus slant height.

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Cone Slant Height Formula

Slant height of the cone equals the square root of radius squared plus height squared.

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Pyramid Volume

Volume is one third times the base area times the height.

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Square Pyramid Surface Area

Surface area equals base area plus two times the base side times slant height.

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Rectangle Formulas

Area = l * w, Perimeter = 2(l + w)

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Cylinder Formulas

Volume = πr²h, Curved Surface Area = 2πrh, Total Surface Area = 2πr(r + h)

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Study Notes

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Description

Explore mensuration, the branch of mathematics focused on measuring geometric shapes. Learn to calculate the area and perimeter of squares, rectangles, and triangles. Understand the formulas for basic 2D shapes.

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