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Angles Flashcards

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Questions and Answers

What is a right angle?

An angle less than 90 degrees

An angle greater than 90 degrees

An angle that is exactly 90 degrees (correct)

An angle that is exactly 180 degrees

What defines an obtuse angle?

An angle greater than 90 degrees and less than 180 degrees (correct)

An angle less than 90 degrees

An angle exactly 90 degrees

An angle exactly 180 degrees

What is a straight angle?

An angle less than 90 degrees

An angle greater than 90 degrees

An angle that measures exactly 180 degrees (correct)

An angle that measures exactly 360 degrees

What is a vertex?

A point where two or more rays meet. Signup and view all the answers

What defines an acute angle?

An angle greater than 0 degrees and less than 90 degrees Signup and view all the answers

What is an isosceles triangle?

A triangle with 2 sides of the same length and 2 equal angles. Signup and view all the answers

What is an equilateral triangle?

A triangle with 3 equal sides. Signup and view all the answers

What is an obtuse triangle?

A triangle with one angle greater than 90 degrees. Signup and view all the answers

What is an acute triangle?

A triangle where each angle is less than 90 degrees. Signup and view all the answers

What is a right triangle?

A triangle with one right angle. Signup and view all the answers

What is a reflex angle?

An angle greater than 180 degrees but less than 360 degrees. Signup and view all the answers

Study Notes

Types of Angles

Right Angle: Measures exactly 90 degrees.
Obtuse Angle: Measures greater than 90 degrees but less than 180 degrees.
Straight Angle: Measures exactly 180 degrees.
Acute Angle: Measures greater than 0 degrees but less than 90 degrees.
Reflex Angle: Measures greater than 180 degrees but less than 360 degrees.

Key Geometric Terms

Vertex: The point where two or more rays or lines meet; also referred to as a corner.

Types of Triangles Based on Angles

Isosceles Triangle: Has two sides of equal length and two equal angles.
Equilateral Triangle: All three sides and angles are equal.
Obtuse Triangle: Contains one obtuse angle (greater than 90 degrees).
Acute Triangle: All angles measure less than 90 degrees.
Right Triangle: Contains one right angle (exactly 90 degrees).

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Description

Review the fundamental concepts of angles with these flashcards. Each card provides a key term along with its definition, helping you understand right, obtuse, straight, and acute angles, as well as vertices. Great for quick study and reinforcement of basic geometry concepts.