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zorro

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## Homework Statement

The length of a cylinder is 1.2 x 10^-2 m and its radius is 2.12 x 10^-2 m. What is its volume according to significicant figures?

## Homework Equations

## The Attempt at a Solution

V=(pi)r^2 l

r^2 = 4.49 x 10^-4 (as radius has 3 significant digits)

V= 22/7 x 4.49 x 10^-4 x 1.2 x 10^-2

V= 22/7 x 5.4 x 10^-6 [4.49 x 10^-4 x 1.2 x 10^-2 = 5.388 x 10^-6 = 5.4 x 10^-6 as least no. of significant digits is 2 here)

so V=1.7 x 10^-5

Answer is 16.9 x 10^-6