Question

1. If Salwa constructs a triangle using her protractor, and the first two

angles she constructed were 55° and 105°, what will the third angle be
when she is done?
80°
30°
20°
55

Answer 1

Answer: 20°

Explanation:

Hi, to answer this question we have to analyze the information given:

Angle 1 = 55°

Angle 2 = 105°

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

So:

180 = 55+105 + x

Where x is the missing angle.

Solving for x:

180-55-105 =x

20°=x

Feel free to ask for more if needed or if you did not understand something.