A ball used to play table tennis has a diameter of 40mm. Estimate the surface area of this ball. Calculate the surface area.

Question

0

1350

4

A ball used to play table tennis has a diameter of 40mm.

a)Estimate the surface area of this ball.

b)Calculate the surface area, to the nearest square millimetre. How close was your estimate?

Guest Dec 2, 2014

+5

Best Answer

Do the calculations and put how you did it.

Guest Dec 2, 2014

Guest · Answer 1 · 2014-12-02T12:52:58

Do the calculations and put how you did it.

geno3141 · Answer 2 · 2014-12-02T12:32:16

The formula for the surface area of a sphere is: Area = 4·π·r²

Since the diameter is 40 mm, the radius is 20 mm.

The area is found by: 4·π·20²

Guest · Answer 3 · 2014-12-02T12:49:10

whats the answer?

Melody · Answer 4 · 2014-12-02T12:50:38

There is a calulator on the home page. USE IT

FOR THE ESTIMATION PART YOU CAN ESTIMATE PI AT 3