Triangle Properties

Front

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

Back

180°

Front

What is a midsegment in a triangle?

Back

A line segment that connects the midpoints of two sides of a triangle.

Front

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

Back

Right triangle.

Front

What is the relationship between the angles in a triangle?

Back

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

Front

What is the measure of the third angle if two angles are 50° and 60°?

Back

70°

Front

What is the definition of an equilateral triangle?

Back

A triangle with all three sides of equal length and all angles measuring 60°.

Front

What is the definition of an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is the definition of a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

How do you find the missing angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Front

What is the exterior angle theorem?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.