Find the surface area of each rectangular prism. round to nearest tenth if necessary

1. 314cm²

2. 216.16 sq ft

Step-by-step explanation:

there are six sides in each rectangular prism

to find the surface area, fins the area of each side and then add them together to find the total surface area!

1) 8cm x 9cm = 72cm²

x 2 (because there are two of the same sides) = 144cm²

5cm x 8cm = 40cm²

x 2 = 80cm²

144cm² + 80cm² = 224cm²

5cm x 9cm = 45cm²

x 2 = 90cm²

224 + 90 = 314cm² = total surface area

2) repeat the same process!

(12ft x 6.4ft) x 2 = 153.6sq ft

(6.4ft x 1.7ft) x 2 = 21.76 sq ft

(12ft x 1.7ft) x 2 = 40.8 sq ft

add these all together =

216.16 sq ft = total surface area

hope this helps :)

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

answer: i believe the answer is e

step-by-step explanation: