Question

find the area of circle with the given diameter 8 cm 20 cm​

Answer 1

Answer:

(i) 50.24 cm²

(ii) 314 cm²

Step-by-step explanation:

(i) Diameter = 8 cm

Radius r = 4

Area = πr² = 3.14 × 4² = 3.14 × 16 = 50.24 cm²

(ii) Diameter = 20 cm

Radius r = 10

Area = πr²​ = 3.14 × 10² = 3.14 × 100 = 314 cm²

Answer 2

Answer:

Question :-

• Find the area of circle with the given diameter 8 cm 20 cm.

Solution :-

(1) Diameter = 8 cm

◘ Radius = D/2

where,

• D = Diameter

➠ Radius = 8/2

➠ Radius = 4 cm

Now, let's find the area of circle,

We know that,

⍟︎ Area of circle = πr²

Then,

➻ Area of circle = 22/7 × (4)²

➻ Area of circle = 22/7 × 4 × 4

➻ Area of circle = 22/7 × 16

➔ Area of circle = 50.24 cm²

∴ The area of circle with diameter 8 cm is 50.24 cm².

(2) Diameter = 20 cm

◘ Radius = D/2

where,

• D = Diameter

➠ Radius = 20/2

➠ Radius = 10 cm

Now, let's find the area of circle,

We know that,

Area of circle = πr²

Then,

➻ Area of circle = 22/7 × (10)²

➻ Area of circle = 22/7 × 10 × 10

➻ Area of circle = 22/7 × 100

➔ Area of circle = 314 cm²

∴ The area of circle with diameter 20 cm is 314 cm².