The base of a regular pyramid is a square and each of the other four sides is an equilateral triangle, length of each side being 20 cm. The vertical height of the pyramid, in cm, isa) 12b) 10√2c) 8√3d) 5√5Correct answer is option 'B'. Can you explain this answer?

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The base of a regular pyramid is a square and each of the other four sides is an equilateral triangle, length of each side being 20 cm. The vertical height of the pyramid, in cm, is

a)
12
b)
10√2
c)
8√3
d)
5√5

Correct answer is option 'B'. Can you explain this answer?

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The base of a regular pyramid is a square and each of the other four ...

It is given that the base of the pyramid is square and each of the four sides are equilateral triangles.

Length of each side of the equilateral triangle = 20cm

Since the side of the triangle will be common to the square as well, the side of the square = 20cm

Let h be the vertical height of the pyramid i.e. OA

OB = 10 since it is half the side of the square

AB is the height of the equilateral triangle i.e. 10√3

AOB is a right angle, so applying the Pythagorean formula, we get

OA² + OB² = AB²

h2 + 100= 300

h=10√2

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The base of a regular pyramid is a square and each of the other four sides is an equilateral triangle, length of each side being 20 cm. The vertical height of the pyramid, in cm, isa) 12b) 10√2c) 8√3d) 5√5Correct answer is option 'B'. Can you explain this answer?

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