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omeli [17]
3 years ago
15

Please!!!! Please Help!!!!! 30 Points!!!!!

Mathematics
2 answers:
CaHeK987 [17]3 years ago
5 0

Answer:

9,951.04

Step-by-step explanation:

First you find the area of the rectangle:

44x88=3,872

Then you add the area of the two semi circles:

A=1/2(pi)(r^2)

A= 3,039.52

Multiply the area above by 2 since there are two semi circles and they are the same size.

Ainat [17]3 years ago
3 0
I don’t know, sorry
______________
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I really need help do can someone do it step by step so I can understand plzzzz​
Alekssandra [29.7K]

Answer:

64 × pi m²

Step-by-step explanation:

the formulas needed for the surface area of a cone are :

base area plus the "mantle", the lateral "wall" around it.

the base area is a circle.

so, that formula is Ac = pi×r²

the "wall" formula is Aw = pi×r×s

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the formula for the surface area of a sphere is

As = 4×pi×r²

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=>

12×pi×r = 3×pi×r²

12×pi = 3×pi×r

12 = 3×r

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now, we only need to use this value of r in our formulas for surface areas, like for the sphere :

4×pi×r² = 4×pi×4² = 4³×pi = 64×pi

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