Triangles: Find the missing angle (Geometry)

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

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

Back

It is a right triangle.

Front

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

Back

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

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is the relationship between the angles in a triangle?

Back

The angles in a triangle are related such that their sum equals 180 degrees.

Front

What is the formula to calculate the missing angle when two angles are known?

Back

Missing angle = 180 degrees - (Angle 1 + Angle 2).

Front

What is the definition of a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

What is the difference between an equilateral triangle and an isosceles triangle?

Back

An equilateral triangle has all three sides equal and all angles equal to 60 degrees, while an isosceles triangle has at least two sides equal and the angles opposite those sides are equal.

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.