Question

Which is x given the angle measures in the pentagon below?


Answer 50
60
65
70

Answer 1

The sum of the angles of a n-gon figure is given by 180(n-2). So since you have a pentagon, n=5 and the sum is 540.

Add up all the angles and set it equal to 540. Then solve for x.

Answer 2

how do u do that?

Answer 3

You have five angle measurements. Add them all together and set it equal to 540...
(x + 25) + (2x - 30) + (x + 35) + (x + 40) + (2x - 20) = 540

Combine like terms (combine all the x's and all the non-x's) and then solve for x.

Answer 4

i got 7x=40

Answer 5

Not quite...double check that. I got 7x=490

Answer 6

The simplified left becomes 7x+50 so that set equal to 540 gives you 7x=490.

Answer 7

o ok i see wat i did wrong

Answer 8

So now the answer becomes obvious :)

Answer 9

yes 70