#1**0 **

The area of a triangle is proportional to its base, so if x is the area of triange ACD, then (x + 20 + 30)/9 = x/7 ==> x = 175.

Guest Mar 15, 2020

#3**+1 **

That is a good observation guest.

Let CD be x units in length and let the height be h

so what is BC?

what is DE?

You need to find AreaACD = xh/2

Set up formulas for the two areas that you know.

Solve them simultaneously to find the value of xh

Note: you probably can solve for x and h independently but it is easier to find the value of xh

Melody
Mar 16, 2020