Question

In a triangle (a ) is x degree (b ) is x +10 degree (c ) is x -10 degree . Find the value of x in triangle

Answer 1

x+x+10+x-10=180 x=60

Answer 2

sum of all angles of a triangle = 180

angle A = x

B = x + 10

C = x - 10

so...

x + (x + 10) + (x - 10) = 180

when we open brackets

x + x + 10 + x - 10 = 180

3x  + 0 = 180

3x = 180

x = $\frac{180}{3}$

x = 60

so...

angle A = 60

B = X +10 = 60 + 10 = 70

C = X -10 = 60 - 10 = 50

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