Question

Find the area of the following circles, given that:
22
(a) radius = 14 mm (Take it =
(c) radius = 5 cm
22
(b) diameter = 49 m​

Answer 1

Answer:

(a) Radius = 14mm

Area of a circle = 2π$r^{2}$

                         = 2 x $\frac{22}{7}$ x 14 x 14

                         = 2 x 22 x 2 x 14

                         = 1232 $mm^{2}$

(b) Radius = 5mm

Area of a circle = 2π$r^{2}$

                         = 2 x $\frac{22}{7}$ x 5 x 5

                         = $\frac{1100}{7}$ $cm^{2}$

(c) Diameter = 49

     Radius = $\frac{49}{2}$

Area of a circle = 2π$r^{2}$

                         =  = 2 x $\frac{22}{7}$ x $\frac{49}{2}$ x $\frac{49}{2}$

                         = 3773 $m^{2}$

Answer 2

Answer:

(a) given : r= 14

so. area of circle = 2 pi r² (pi=22/7)

= 2×22/7×14×14

= 2×22×2×14

= 123,2cm²----------(1)

(b) given : d=49. (we wants radius)

r=d/2

r=24.5

so. area of circle = 2 pi r²

= 2×22/7×24.5×24.5

= 2×22×3.5×24.5

= 3,307.5cm² -----------(2)

(c) given r=5

so. area of circle = 2 pi r.

= 2× 22/7×5×5

= 2×1.4×22×5

= 308cm²----------(3)