Question

if 2 angles of a triangle are 90 and 45 then find the value of 3 angle

Answer 1

let the 3rd angle be x

90 + 45 + x = 180 (sum of all angles of a triangle is 180)
135+x = 180
x= 45

3rd angle is 45

Answer 2

Here is your solution

Given :-

Two angles of triangle 90° And 45°

Let,

angle be A and B

A=90° and B=45°

Third angle be C

We know that

∠A+∠B+∠C=180°(sum of △)

90°+45°+∠C=180°

∠C+135°=180°

∠c=180°-135°

∠c=45°

Hence, third angle=∠c=45°