Question

Find the surface area of the prism 3m 4m 8m 5m

Answer 1

Answer:

Step-by-step explanation:

Two triangles.

one triangle = 1/2 * small leg * middle sized leg

one triangle = 1/2 * 3 * 4

One triangle = 6

Two triangles = 6 * 2 =                                            12

Front

Area = L * W

L = 8

W = 5

Area = 8*5                                                              40

Left Side

L = 8

W = 3

Area = 8*3

Area = 24

Area=                                                                     24

Right Side

L = 8

W = 4

Area =                                                                  32

Total Area = 32 + 24 + 40 + 12                          108

There is another way to do this.

Since the height is the same for all three faces, you can do it like this

Area = 8*(3 + 4 + 5) = 8(j12) = 96

Area of the two tiangles     = 12

Total area =                          108

Answer 2

Answer:

3 x 4 = 12, 12 divided by 2 ) x 1/2) = 6, 6 x 2 = 12(area of two triangles)

8 x 4 = 32

8 x 3 = 24

8 x 5 = 40

Let's add all the given areas:

12 + 32 + 24 + 40 = 108 m^2 is your answer.