Question

uc
21. One of the angles of a triangle is equal to sum
of other two angles. What is the value of that
angle
(A) 60
(B) 90°
(C) 120
(D) 180°
​

Answer 1

Answer:

all the triangles have the same property...the sum of angles of all triangle is 180°....and here you need which angle value sis..!! the 3 rd angle or first 2 angles

Answer 2

Explanation:

let , one of the angle=x

x is sum of two angles

two angles= y,z

so, x is sum of two angles

so, x=y+z

sum of angles of a triangle= 180°

so, x+y+z=180°

we know that: y+z= x

so, by substituting....

x+y+z=180°

x+x= 180°

2x= 180°

x= 180/2= 90°

so, x= 90°

so, value of that angle= 90°

therefore, option (B) is correct..

hope it helps you friend!