Angles and Triangles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex). It is measured in degrees.

Front

What are the different types of angles?

Back

The different types of angles are acute (less than 90°), right (exactly 90°), obtuse (greater than 90° but less than 180°), and straight (exactly 180°).

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices. The sum of the interior angles of a triangle is always 180°.

Front

What are the types of triangles based on angles?

Back

Triangles can be classified as acute (all angles less than 90°), right (one angle exactly 90°), or obtuse (one angle greater than 90°).

Front

What is the formula to find the sum of angles in a triangle?

Back

The sum of the interior angles in a triangle is always 180°.

Front

How do you find the measure of a missing angle in a triangle?

Back

To find a missing angle, subtract the sum of the known angles from 180°.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side. The measure of an exterior angle is equal to the sum of the two opposite interior angles.

Front

What is the relationship between angles in a linear pair?

Back

In a linear pair, the two angles are adjacent and their measures add up to 180°.

Front

What is the value of 'x' if two angles are complementary?

Back

Two angles are complementary if their measures add up to 90°. If one angle is known, subtract it from 90° to find 'x'.

Front

What is the value of 'x' if two angles are supplementary?

Back

Two angles are supplementary if their measures add up to 180°. If one angle is known, subtract it from 180° to find 'x'.