Question

Give the correct answer! (only answer if you know!)

The height of a square pyramid is 12 cm and it's slant height is 20cm. what is the length of it's base?

Answer 1

Answer:

For a square pyramid

Base edge =s=12cm

Slant height =l=10cm

Since the base of the pyramid is square,

Therefore, a=2diagonal

Diagonal of square of base 122cm

a=62cm

h=102−a2=102−622=100−72=18=32cm

Volume=31s2h=31×18×8=1442cm3

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Step-by-step explanation:

Answer 2

Slant height means the height of the slanting triangle and all four are the same shape.

using Pythagoras:

Let x be half the length of one side,

x² + 10² = 20²

x² = 400 - 100 = 300

x = √300 = 34.6

Length of bas edge = 34.64 cm or 35 cm rounded.

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