Question

What is the value of x in the pentagon above?

Answer 1

The sum of the interior angles of a pentagon is 540°.

We can use this information to find the value of x by adding the rest of the interior angles and then substracting them from 540°:

`\begin{gathered} 90+90+100+105+x=540 \\ 385+x=540 \\ x=540-385 \\ x=155 \end{gathered}`

It means that the correct answer is b. 155.