Question

A student takes a rectangular piece of paper 30cm long and 21cm wide. Find the area of the biggest circle that can be cut out from the paper. Also find out the area of the paper left after cutting out the circle

Answer 1

Answer:

Area Of The Circle= 346.5 cm²

Area Of Paper Left= 283.5 cm²

Step-by-step explanation:

The Biggest Circle What Can Be Cut By The Rectangular Piece Of Paper will have diameter = 21cm [as 21 cm is the wide of rectangle so more than that cant be cut]

So Radius Of Circle = Diameter/2

                                = 21/2 = 10.5cm

Now Area Of The Circle = pi r²

                                      = 22 * 105 * 105

                                         --------------------  [taking decimal out]

                                          7  * 10   * 10

                                       = 346.5 cm²

 

Area Of Paper Left = Area Of Rectangle - Area of Circle

                              = 30 * 21 - 346.5

                              = 630 - 346.5

                              = 283.5 cm²

Therfore,

Area Of The Circle= 346.5 cm²

Area Of Paper Left= 283.5 cm²