Question

4.

Above is a regular square-based pyramid. If X = 5 cm and L = 4 cm, where L is the slant height, what is the surface area of the pyramid?

105 cm2
50 cm2
65 cm2
40 cm2
https://app30.studyisland.com/userfiles/ok8pyr2.gif

Answer 1

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Answer 2

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Answer 3

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Answer 4

Area of triangle = 1/2 * base * height = 1/2 * X * L = 1/2 * 5 * 4 = 10
There are 4 such triangles. So 4 * 10 = 40.
There is a square base and its area = X^2 = 5^2 = 25

Total surface area = area of 4 triangles + area of square = 40 + 25 = 65 cm^2