Angles

Front

What is an angle?

Back

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

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

What is a triangle?

Back

A polygon with three edges and three vertices.

Front

What are the types of triangles based on angles?

Back

Acute (all angles < 90°), Right (one angle = 90°), Obtuse (one angle > 90°).

Front

What are the types of triangles based on sides?

Back

Equilateral (all sides equal), Isosceles (two sides equal), Scalene (no sides equal).

Front

What is the sum of the interior angles of a triangle?

Back

180°.

Front

If one angle of a triangle is 90°, what type of triangle is it?

Back

It is a right triangle.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.