Question

An approximately circular lake has a diameter of 25 km. You measure the depth at several throughout the lakeand find the average depth is 15 m. What is the approximate volume of water in the lake?(a).7 x 10°m(b) 4 x 103 m3(c) 2 x 10-11 m3(d) 8 x 1014 m

Answer 1

Volume of a cylinder = π r^2 h

Where:

r = radius = diameter /2 = 25/2 = 12.5 km = 12,500 m

h = height = 15 m

Replacing:

V = π (12,500)^2 (15) = 7,363,107,782 m3

Approximate volume = 7,000,000,000 = 7 x 10^9 m3 (a)