Question

A circle has a radius of 8.5cm correct to the nearest 0.1cm.

the lower bound of the area of the circle is pπ cm².
the upper bound of the area of the circle is qπ cm².

find the value of p and the value of q.

Answer 1

The area of the circle is exactly π times the square of its radius. If you are given that the radius is within 0.1cm of 8.5cm, i.e. lies between 8.4 cm and 8.6 cm, its square will lie between p=8.4² = 70.56 and q=8.6² = 73.96 cm².

Explanation:

thanks for question dear

Answer 2

The area of the circle is exactly π times the square of its radius. If you are given that the radius is within 0.1cm of 8.5cm, i.e. lies between 8.4 cm and 8.6 cm, its square will lie between p=8.4² = 70.56 and q=8.6² = 73.96 cm².