Question

A rectangular pane of glass is 91.1 cm wide and 155.9 cm long, and its area is equal to the length multiplied by the width. Using the correct number of significant figures, what is the area of the glass?

Answer 1

911.1×155.9 = 14,202.49
14,202.49 in 3 significant figures would be either 14,200 or 1.42×10^4

Answer 2

Answer:

$Area = 14200 cm^2$

Explanation:

As we know that the area of the rectangle is given as

$Area = Length \times Width$

now we will have

$Length = 155.9 cm$

$Width = 91.1 cm$

here we know that significant digits in length is 4 while significant digits in width is 3.

so here we can say that Area must have three significant figures

so we will have

$Area = 155.9 \times 91.1$

$Area = 14202.49 cm^2$

so by rounding off in three significant figures the area will be

$Area = 14200 cm^2$