Triangles

Front

What is an exterior angle in a triangle?

Back

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

Front

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

Back

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

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length and the angles opposite those sides are also equal.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides of equal length and all three angles measuring 60 degrees.

Front

What is a right triangle?

Back

A right triangle has one angle that measures exactly 90 degrees.

Front

How do you find the missing angle in a triangle?

Back

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

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

Front

What is a corresponding angle?

Back

Corresponding angles are angles that are in the same position on two parallel lines cut by a transversal.

Front

What is the relationship between exterior angles and interior angles?

Back

An exterior angle is equal to the sum of the two opposite interior angles.

Front

If one angle of a triangle is 60 degrees and another is 70 degrees, what is the third angle?

Back

The third angle is 50 degrees (180 - 60 - 70 = 50).