Question

if two angles of a triangle are 40 degree and 60 degree then the measure of third angle will be what​

Answer 1

Step-by-step explanation:

Two angle of triangle are 40° and 60°

Then,

let , the third be x ,

so,

x + 40° + 60° = 180° ( sum of interior angle of triangle)

x + 100° = 180°

x = 80°

Answer 2

Given: Two angles of a triangle are 40° and 60°

To find: Measure of the third angle

Let: The third angle be $x$

Solution: According to the given question and assumption made,

Two angles of a triangle measure 40° and 60°.

Third angle has been assumed to be  $x$.

We know that,

∵ Sum of interior angles of a triangle = 180°

∴ $x$ + 40° + 60° =  180°

⇒ $x$ + 100° = 180°

⇒ $x$ = 180° - 100° = 80°

Hence, the measure of third angle is 80°.