Question

find the measure of 3rd angle​

Answer 1

Answer:

Step-by-step explanation:

Let the angles be a, b, c

Therefore

a+b=c..........given....... 1

And

a+b+c=180............angle sum property

From 1

c+c=180................a+b=c

2c=180

c=180/2

c=90

Therefore

Third angle is 90degree

Answer 2

Let the two angles of triangle be x & y.

Then third angle will be (x+y).

Sum of all angle of a triangle = 180

x + y + (x+y) = 180

2x + 2y = 180

2 (x+y) = 180

(x+y) = 180 ÷ 2

x+y = 90°

So the third angle is 90°.

ALL THE BEST for your test :)