Question

PLEASE HELP! I WILL GIVE BRAINLYEST TO WHOEVER ANSWERS FIRST! PLEASE PLEASE BE QUICK! thank you! and please include explanation cause i need to learn to do it for my other problems! THANK YOU!!!!
Find the surface area of the prism.

Answer 1

Answer:

A=920 ft.

Step-by-step explanation:

Using the formulas

A=2AB+(a+b+c)h

AB=s(s﹣a)(s﹣b)(s﹣c)

s=a+b+c

2

Solving for A

A=ah+bh+ch+1

2﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=8·20+17·20+15·20+1

2·﹣84+2·(8·17)2+2·(8·15)2﹣174+2·(17·15)2﹣154=920