AO ⊥ (BCD)
OB = OC = OD = 12
m∠ACO = 20º
BD = CD = BC
Find: V and Surface Area of a triangular pyramid

V = 272.3 cube units

The surface area is 418.34 square units

3 ft

step-by-step explanation:

since the triangle is right use pythagoras' identity to solve for a

the square on the hypotenuse is equal to the sum of the squares on the other two sides, that is

a² + 8² = ( )²

a² + 64 = 73 ( subtract 64 from both sides )

a² = 9 ( take the square root of both sides )

a = = 3

answer: answer

step-by-step explanation: