Geometry Angles Flashcards

Questions and Answers

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

The angles are equal in measure

The sides are equal in length

Both A and B (correct)

None of the above

What is the definition of alternate exterior angles?

Alternate exterior angles are outside the parallel lines on opposite sides of the transversal and are congruent.

What are supplementary angles?

Two angles whose measures add to 180°.

What defines vertical angles?

Vertical angles are congruent angles opposite each other when two lines cross. Signup and view all the answers

What is the sum of the measures of complementary angles?

90°. Signup and view all the answers

What is a transversal?

A line that crosses two or more (usually parallel) lines. Signup and view all the answers

How many degrees are in a right angle?

90 degrees. Signup and view all the answers

What is the minimum amount of degrees in an obtuse angle?

91 degrees. Signup and view all the answers

What is the maximum amount of degrees in an acute angle?

89 degrees. Signup and view all the answers

What is an isosceles triangle?

A triangle with at least two sides of equal length. Signup and view all the answers

What is an equilateral triangle?

A triangle with all three sides of equal length. Signup and view all the answers

What is a right angle?

An angle that measures exactly 90 degrees. Signup and view all the answers

Study Notes

Angle Types and Properties

Congruent Angles: Angles that have the same measure.
Alternate Exterior Angles: Congruent angles located outside parallel lines on opposite sides of a transversal.
Alternate Interior Angles: Congruent angles located inside parallel lines on opposite sides of a transversal.
Supplementary Angles: Two angles whose measures add to 180 degrees.
Linear Pair: A pair of adjacent angles that form a straight line, and thus are supplementary.
Vertical Angles: Congruent angles formed opposite each other when two lines intersect.

Angle Relationships

Corresponding Angles: Congruent angles located in matching corners when a transversal crosses parallel lines.
Same Side Interior Angles: Supplementary angles located inside parallel lines on the same side of the transversal.
Same-Side Exterior Angles: Supplementary angles located outside parallel lines on the same side of the transversal.

Angle Measurements

A Right Angle measures exactly 90 degrees.
An Obtuse Angle is defined as measuring more than 90 degrees but less than 180 degrees (minimum 91 degrees).
An Acute Angle is defined as measuring less than 90 degrees (maximum 89 degrees).
Complementary Angles: Two angles whose measures add to 90 degrees.

Special Triangle Types

Isosceles Triangle: A triangle with at least two congruent sides.
Equilateral Triangle: A triangle with all three sides and angles congruent.

Transversal Definition

A Transversal is a line that intersects two or more lines (usually parallel).

General Information About Angles

Linear pairs are supplementary angles formed by intersecting lines.
Vertical pairs refer to vertical angles, which are always congruent.

These notes summarize fundamental concepts regarding angles, their relationships, and specific types of triangles, providing a foundation essential for understanding geometric principles.

Description

Test your knowledge of geometry with this set of flashcards focused on angles. Each card features essential terms such as congruent angles and supplementary angles alongside their definitions. Perfect for students studying geometry and preparing for quizzes or exams.