math
posted by keisha .
Find the surface area of the right triangular prism. Round to the nearest tenth if necessary. The height is 2.5 cm, the length is 8 cm, and the width is 5.3 cm. I need help.

a1=5.5*2.5
=13.25 cm2
a2=5.3*8
=42.4cm2
a3=2.5*8/2
=10
then times by 2 cause to right triangles =20cm2
a4=8.38*5.3
=44.42
at=13.25+42.4+44.42+20
=120.11cm2