Question

Two angles of triangle are 45° and 55º. Find the measure of third angle​

Answer 1

Answer:

As we know

sum of all angles is 180°

Let the third angle be x

45°+55°+x = 180°

x+100° = 180°

x =180°-100°

x = 80°

our answer is 80 degree

Answer 2

Step-by-step explanation:

addition of sides of triangle is 180

let the third angle be x

hence,

45 + 55 +x -- 180

x -- 180 - 100

x -- 80

the third angle of triangle is 80 degree

proof,

45 +55 +80-- 180