Example:
The area of a sector whose radius is 9cm is 130 sq.cm. Find the perimeter of the sector.

Solution:
Given that,
A = 130 sq.cm., r=9 cm. Formula A = lr/2
Therefore, l = 2A/r
l = (2*130)/9
l = 28.89 cm.
Hence the perimeter of the sector = 2r + l
= 2*9 + 28.89
= 46.89 cm.

Directions: Solve the following problems and correct the answer at two decimal place. Also write at least ten examples of your own.