Triangles-Missing 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°.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three angles are equal, each measuring 60°.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle measuring 90°.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length and the angles opposite those sides are equal.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle in which all three sides are of different lengths and all three angles are of different measures.

Front

How do you find a missing angle in a triangle?

Back

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

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle measuring more than 90°.

Front

What is the measure of the missing angle if two angles are 70° and 60°?

Back

The missing angle is 50° (180° - (70° + 60°)).

Front

What type of triangle has one angle greater than 90°?

Back

An obtuse triangle.

Front

What is the measure of the missing angle if one angle is 140° and another is 25°?

Back

The missing angle is 15° (180° - (140° + 25°)).