Question

1. From a square cardboard of side 21 cm, a circle of maximum area is cut out. The area of the card board left is a. 100 cm2 b. 94.5 cm2 c. 90 cm2 d. Data Insufficient

Answer 1

Answer:

94.5 cm square

Step-by-step explanation:

Side of a square cardboard = 21 cm

Therefore, area = side x side

= 21 cm x 21 cm

= 441 cm square

Diameter of the circle = 21 cm

Radius = 21/2 cm = 10.5 cm

Area = pi x r square

= 22/7 x 10.5 square

= 22/7 x 110.25

= 346.5 cm square

So, area left in the cardboard

= (441 - 346.5) cm square

= 94.5 cm square

Hope it helps...!!