Question

What is the measure of the third angle of
an obtuse-angled triangle if the measure of
two of its angles are
a. 115°,45°?

Answer 1

Answer:

The last angle will be 20°

Step-by-step explanation:

Let the last angle be x

so,

115°+45°+x=180°

160°+x=180

x=180°-160

x=20°

Answer 2

Answer:

20°

Step-by-step explanation:

sum of all sides of a triangle = 180°

let the third side be x

x + 115° + 45° = 180°

x + 160° = 180°

x = 180-160

x = 20°