Question

Find the value of x. *1 point66(3x + 21)5715Ο ΟΟ Ο10

Answer 1

Given that the total sum of interior angles of a triangle = 180 degrees.

Thus, we have:

(3x + 21) + 66 + 57 = 180

Let's find the value of x.

3x + 21 + 66 + 57 = 180

3x + 144 = 180

Subtract 144 from both sides:

3x + 144 - 144 = 180 - 144

3x = 36

Divide both sides by 3:

`\begin{gathered} (3x)/(3)=(36)/(3) \\ \\ x\text{ = 12} \end{gathered}`

ANSWER:

12