Bellwork Feb 13: Angles of a Triangle

Front

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

Back

180 Degrees

Front

Find the measure of angle A if angle B is 45 degrees and angle C is 55 degrees.

Back

Angle A = 80 degrees (180 - 45 - 55 = 80).

Front

What do you call an angle that measures less than 90 degrees?

Back

Acute angle.

Front

What do you call an angle that measures exactly 90 degrees?

Back

Right angle.

Front

What do you call an angle that measures more than 90 degrees but less than 180 degrees?

Back

Obtuse angle.

Front

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

Back

50 degrees (180 - 60 - 70 = 50).

Front

In a triangle, if two angles are equal, what type of triangle is it?

Back

Isosceles triangle.

Front

What is the measure of each angle in an equilateral triangle?

Back

60 degrees.

Front

If angle A is 30 degrees and angle B is 60 degrees, what is angle C?

Back

90 degrees (180 - 30 - 60 = 90).

Front

What is the relationship between the angles in a right triangle?

Back

One angle is 90 degrees, and the sum of the other two angles is 90 degrees.