Find the volume v of the described solid s. a right circular cone with height 7h and base radius 3r

Answer in cm if you need something else state it in the question.

r = 3 cm
h = 7 cm
s = 7.61577 cm
V = 65.9734 cm³
L = 71.777 cm²
B = 28.2743 cm²
A = 100.051 cm²

Agenda:

r = radius
h = height
s = slant height
V = volume
L = lateral surface area
B = base surface area 
A = total surface area
π = pi = 3.14159
√ = square root

Formula: Volume of a cone: V = (1/3)πr²h