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lakkis [162]
3 years ago
15

Please help me !!!!!

Mathematics
1 answer:
Rudik [331]3 years ago
4 0
The surface area of a shape is the area of each face added together.

Triangles
The area of a triangle is 1/2*w*h. So 1/2*6*8 = 24. We have two of these faces, so we'll add this twice.

Outer Rectangles
The area of a rectangle is w*h, so for these we'll do 9*20 = 180. These shapes are again duplicates, so we'll add them twice.

Center Rectangle
Again, we know the area of a rectangle is w*h, so 6*20 = 120. This is the only shape that isn't repeated.
Finally, we need to add the areas of the shapes up. 

24 + 24 + 180 + 180 + 120 = 528

Therefore the surface area of the net is 528 cm^2.
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