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The radius of a sphere inscribed in a square pyramid

ÀÛ¼ºÀÚ Uploader : cannon ÀÛ¼ºÀÏ Upload Date: 2022-06-16º¯°æÀÏ Update Date: 2022-06-16Á¶È¸¼ö View : 280

The radius r of a sphere inscribed inside a square pyramid can be calculated as follows.

h is the height of the square pyramid and a is the side length of a square base.

The length b of the perpendicular bisector of the side triangle to the base is:

b = ((a/2)^2 + h^2)^(1/2)

According to the similarity ratio of a right triangle,

b : a/2 = h-r : r

Therefore,

b*r = a*h/2 - a*r/2

r is as follows.

(a + 2*b)*r = a*h

r = a*h / (a + 2*b)

= a*h / (a + 2*((a/2)^2 + h^2)^(1/2))

*** Âü°í¹®Çå[References] ***

r = a*h / (a + 2*((a/2)^2 + h^2)^(1/2))
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