Question

Find EF in the trapezoid

Answer 1

EF is halfway between AD and BC.

Using the midpoint formula:

`4x=((x+6)+57)/(2)`
⇒
`4x=(x+63)/(2)`
⇒
`8x=x+63`
⇒
`7x=63`
⇒
`x=9`

EF is
`4x=4(9)=36`