Question

In triangle PQR , angle P =45° and angle Q = 55°. The measure of angle R is _______.
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Answer 1

Sum of all interior angles in a triangle = 180°

1st angle = 45°

2nd angle = 55°

Let third angle be x

Then,

55+45+x=180

100+x=180

x=180-100

x=80

So the third angle is 80°

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Answer 2

Answer:

Angle R is 80 degrees

Step-by-step explanation:

In Triangle PQR Angle P+Q+R =180 .....Sum of measures of angles of triangle is 180 degrees.

So 45+55+R=180

So 100+R=180

So Angle R=180-100

Angle R =80 degrees.