Question

Area of circular disc is 38.5 CM square find its circumference (take pie 22/7

Answer 1

Answer:

22 cm

Step-by-step explanation:

Let the radius of circular disc be R

Area of Circular Disc = 38.5 cm²

We know that Area of Circle = π(Radius)²

∴ π × R² = 38.5

22/7 × R² = 38.5

R² = (38.5 × 7)/22

R² = 3.5 × 3.5

R² = 3.5²

R = 3.5 cm

Now, Circumference of Circle = 2π×Radius

∴ Circumference of given Circular Disc = 2 × (22/7) × 3.5

                                                                 = 22 cm

Answer 2

Area of circular disc=38.5cm²
πr²=38.5cm²
$\frac{22}{7} \times r^{2} = 38.5$
${r}^{2} = \frac{38.5 \times 7}{22}$
${r}^{2} = 12.25$
$r = \sqrt{12.25}$
r=3.5cm
Circumference of circular disc=2πr
$= 2 \times \frac{22}{7} \times 3.5$
=44*0.5
=22cm