Mr. Policastro's Trigonometry Flashcard - Find the missing angle

Front

What is the sum of angles in a triangle?

Back

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

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

How do you find the missing angle in a triangle when two angles are known?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the definition of an acute angle?

Back

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

Front

What is the definition of an obtuse angle?

Back

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

Front

If one angle in a triangle is 60 degrees and another is 70 degrees, what is the missing angle?

Back

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

Front

What is the relationship between complementary angles?

Back

Complementary angles are two angles whose sum is 90 degrees.

Front

What is the relationship between supplementary angles?

Back

Supplementary angles are two angles whose sum is 180 degrees.

Front

If two angles are equal in a triangle, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the formula for finding the missing angle in a right triangle?

Back

In a right triangle, the missing angle can be found by subtracting the known angle from 90 degrees.