A tiankeng is a sinkhole with nearly vertical walls. The Tianpingmiao tiankeng is approximately cylindrical with a diameter of 180
meters and a depth of 420 meters.
a. If the top of the tlankeng is open and plants can grow on the bottom and sides, what is the surface area available for plants? Round to the
nearest square meter.
m²
b. What is the volume of water that could fill the Tianpingmiao tiankeng? Round to the nearest cubic meter.