Question

one of the angle of a triangle is equal to the sum of the another to find the measure of this angle​

Answer 1

90 degree

Step-by-step explanation:

Let "a" be the measure of the angle A;

Let "b" be the measure of the angle B;

Let "c" be the measure of the angle C.

Then

a + b + c = 180, (1)

a + b = c. (2) (given).

Add the equation (1) and (2). You will get

2(a+b) + c = 180 + c.

Simplify:

2(a+b) = 180 ---> a + b = 180/2= 90

Answer 2

Step-by-step explanation:

Let one angle be x.

other two be y and z respectively.

according to question,

x=y+z

x+y+z=180(angle sum property)

y+z+y+z=180

2(y+z)=180

y+z=x=90

y=z

y+y=90

2y=90

y=z=45.