Question

The angle of a triangle are x minus 40 x minus 20 and 1.2 x minus 10 find the value of x

Answer 1

Step-by-step explanation:

We know that sum of all the angles of a triangle are 180°

So,

$(x - 40) \degree + (x - 20) \degree + (1.2x - 10) \degree = 180 \degree \\ 3.2x - 70\degree = 180 \degree \: \\ 3.2x = 180 \degree \: + 70\degree \\ 3.2x = 250 \degree \\ x = \frac{ 250 \degree }{3.2} \\ x = \frac{2500 \degree}{32} \\ x = 78.125\degree$