Question

Radius of a circle is (21 ± 0.1) cm find its area with error.​

Answer 1

Step-by-step explanation:

Answer

Radius of a circle, r = 21 cm

Perimeter of a quadrant, P=(

2

π

+2)r units

=(

7×2

22

+2)×21=(

14

22

+2)×21

P=(

14

22+28

)×21=

14

50

×21

=75cm.

Area of a quadrant, A=

4

πr

2

sq. units

A=

7

22

×

4

21×21

=346.5cm

2

.

Answer 2

Step-by-step explanation:

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