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Vladimir79 [104]
3 years ago
7

You are making an umbrella that is shaped like a regular octagonal pyramid.

Mathematics
1 answer:
guajiro [1.7K]3 years ago
8 0

Answer:

80 ft²

Step-by-step explanation:

From the diagram

The umbrella has a total of 8 triangle.

Applying

A = 8(bh)/2

A = 4bh...................... Equation 2

Where A = Amount of fabric, b = base of one of the triangle in the octagonal pyramid, h = height of the triangle.

From the diagram,

Given: b = 4 ft, h = 5 ft

Substitute these values into equation 2

A = 4×4×5

A = 80 ft²

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