Math Vocab 5: Geometry Part 2

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Questions and Answers

What is an acute angle?

An angle whose measure is less than 90 degrees. (correct)

An angle whose measure is exactly 90 degrees.

An angle whose measure is exactly 180 degrees.

An angle whose measure is greater than 90 degrees and less than 180 degrees.

What is an obtuse angle?

An angle whose measure is exactly 180 degrees.

An angle whose measure is greater than 90 degrees and less than 180 degrees. (correct)

An angle whose measure is exactly 90 degrees.

An angle whose measure is less than 90 degrees.

What is a straight angle?

An angle whose measure is exactly 180 degrees. (correct)

An angle whose measure is less than 90 degrees.

An angle whose measure is exactly 360 degrees.

An angle whose measure is greater than 90 degrees and less than 180 degrees.

What is a protractor used for?

A tool used to measure or create angles with exact measurements. Signup and view all the answers

What does the term 'slide' refer to in geometry?

Transformation that involves moving a shape on a plane in a certain distance (translation). Signup and view all the answers

What does 'flip' mean in geometric transformations?

Transformation that involves turning a shape so it faces the opposite direction (reflection). Signup and view all the answers

What is a turn in terms of geometry?

Transformation that involves rotating a shape on a plane (rotation). Signup and view all the answers

What does it mean for shapes to be similar?

They share the same shape but are proportionally larger or smaller in size. Signup and view all the answers

What does it mean for shapes to be congruent?

They share the same shape and the same size. Signup and view all the answers

What is an equilateral triangle?

The length classification of a triangle with 3 sides of equal length. Signup and view all the answers

What is a scalene triangle?

The length classification of a triangle whose sides are each different length. Signup and view all the answers

What is an isosceles triangle?

The length classification of a triangle with 2 sides of equal length. Signup and view all the answers

What is a right triangle?

The angle classification of a triangle with one right angle. Signup and view all the answers

What is an obtuse triangle?

The angle classification of a triangle with one obtuse angle. Signup and view all the answers

What is an acute triangle?

The angle classification of a triangle with 3 acute angles. Signup and view all the answers

What is the circumference of a circle?

The length of the boundary of a circle. Signup and view all the answers

What is a chord in a circle?

A straight line segment whose endpoints both lie on the circumference of a circle. Signup and view all the answers

What is a diameter?

Any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. Signup and view all the answers

What is a radius?

A straight line from the center to the circumference of a circle or sphere. Signup and view all the answers

What is the origin in a coordinate plane?

The (0,0) point where the x and y intersect. Signup and view all the answers

Study Notes

Angles in Geometry

Acute Angle: Measures less than 90 degrees.
Obtuse Angle: Measures greater than 90 degrees but less than 180 degrees.
Straight Angle: Measures exactly 180 degrees.

Tools for Measuring Angles

Protractor: Essential tool for measuring or creating angles with precision.

Transformations in Geometry

Slide (Translation): Moving a shape smoothly across a surface without rotation or flipping.
Flip (Reflection): Turning a shape over to face the opposite direction.
Turn (Rotation): Rotating a shape around a fixed point on a plane.

Classification of Shapes

Similar Shapes: Identical shape with proportional size differences.
Congruent Shapes: Exact same shape and size without any alteration.

Types of Triangles by Side Length

Equilateral Triangle: All three sides are of equal length.
Scalene Triangle: All three sides have different lengths.
Isosceles Triangle: Two sides are equal in length; may also be equilateral if all sides are equal.

Types of Triangles by Angle

Right Triangle: Contains one right angle (90 degrees).
Obtuse Triangle: Contains one obtuse angle (greater than 90 degrees).
Acute Triangle: All three angles are acute (less than 90 degrees).

Circle Measurements

Circumference: Total distance around the circle's boundary.
Chord: Line segment connecting two points on a circle's circumference.
Diameter: Line segment passing through the center from one edge of the circle to the other.
Radius: Distance from the center of the circle to any point on the circumference.

Coordinate Geometry

Origin: The intersection point of the x and y axes on the coordinate plane, represented as (0,0).

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Description

Test your knowledge of geometric terms with this engaging flashcard quiz. Focused on angles and measuring tools, this set will help reinforce your understanding of acute, obtuse, and straight angles. Perfect for students looking to solidify their geometry vocabulary.