Answer:
ummm im pretty sure you mean area.... 2d shapes dont have surface area.... but ok... also is the bottom 10? i think so.... then its 90 <u><em>MARK AS BRANLIEST BCUZ I SAVED YOU</em></u>
Step-by-step explanation:
1/2x6x(10+20)
1/2x6(30)
3x30
90
10
Symbolab helps a lot!!! I got the answer y=4/5×+1/2