Question

A pyramid on a square base has four equilateral triangles on its four equilateral triangles on its four other faces, each edges being 10 m. find its volume.

Answer 1

V = 1/3 x b² x h 

h² = hyponetuse² - 1/2 x b²

h² = 10² - 5²

= 100 - 25 
= 75 

h = √75 

volume = 1/3 x 10² x √75 

= 288.67 m³