Question

find the area of circle with the given radius (1) 3 cm (2) 12 cm​

Answer 1

Step-by-step explanation:

Area of circle

$= \pi {r}^{2}$

1. When r= 3 cm,

Area =

$\frac{22}{7} \times {3}^{2}$

$= 84.86 { cm}^{2}$

Similarly,

2. When r= 12 cm

Area =

$\frac{22}{7} \times {12}^{2}$

$= 452.57 {cm}^{2}$

Answer 2

Answer:

Question :-

• Find the area of circle with the given radius (1) 3 cm (2) 12 cm

Solution :-

1) Radius = 3 cm

As we know that,

◘ Area of circle = πr²

Then,

➠ Radius circle = 22/7 × (3)²

➠ Radius of circle = 22/7 × 3 × 3

➠ Radius of circle = 22/7 × 9

➔ Radius of circle = 28.26 cm²

∴ The area of circle with radius 3 cm is 28.26 cm².

2) Radius = 12 cm

As we know that,

◘ Area of circle = πr²

Then,

➠ Radius of circle = 22/7 × (12)²

➠ Radius of circle = 22/7 × 12 × 12

➠ Radius of circle = 22/7 × 144

➔ Radius of circle = 452.16 cm²

∴ The area of circle with radius 12 cm is 452.16 cm².