The base of a triangular pyramid is a triangle with corners at (2 ,4 ), (3 ,2 ), and (5 ,5 ). If the pyramid has a height of 5 , what is the pyramid's volume?

1 Answer
May 17, 2018

Volume of triangular base pyramid color(violet)(V = 466.47 cub. units

Explanation:

A (2,4), B (3,2), C (5,5)

Using distance formula,

bar (AB) = c = sqrt((3-2)^2 + (2-4)^2) = sqrt5 = 2.235

bar (BC) = a = sqrt((5-2)^2 + (5-4)^2) = sqrt 10 = 3.162

bar (AC) = b = sqrt((3-5)^2 + (2-5)^2) = sqrt 13= 3.606

Area of base triangle A_b= sqrt(s (s-a) (s-b) (s-c))

Semi perimeter s (a -+ b+ c) / 2 = (2.235 + 3.162 + 3.606)/2 = 18

A_b = sqrt(18* 15.765 * 16.838 * 16.394) = 279.88

Formula for volume of pyramid V = (1/3) * A_b * h

color(violet)(V = (1/3) * 279.88 * 5 = 466.47 cub. units.