Question

Find the area of the following circles
* Find the circumference of the circle wan diameter 75 cm in metres. (Take x = 3.14)
Express the answer in metres​

Answer 1

Answer:

(a) Here, r= 14mm

Area of the circle= \pi r^2πr

2

=\pi\times14\times14=\frac{22}{7}\times14\times14=π×14×14=

7

22

×14×14

(b) Here, diameter= 49m

r=\frac{49}{2}mr=

2

49

m

Area=\ \pi r^2=\ \frac{22}{7}\times\frac{49}{2}\times\frac{49}{2}Area= πr

2

=

7

22

×

2

49

×

2

49

=\frac{3773}{2}m^2=1886.5m^2=

2

3773

m

2

=1886.5m

2

(c) Here, radius= 5cm

Area=\pi r^2=\frac{22}{7}\times5\times5Area=πr

2

=

7

22

×5×5

=\frac{550}{7}m^2=78.57cm^2=

7

550

m

2

=78.57cm

2