Question

22सेमी की परिधि वाले एक वृत्ताकार क्षेत्र का क्षेत्रफल ज्ञात करें

Answer 1

Step-by-step explanation:

Given: Circumference of the circle

C = 22 cm

$\because \: c \: = 2 \pi \: r \\ \therefore \: 22 = 2 \times \frac{22}{7} \times r \\ r = \frac{22 \times 7}{2 \times 22} \\ r = \frac{7}{2} cm \\ now \: \\ area \: of \: circle \: = \pi \: {r}^{2} = \frac{22}{7} \times ( \frac{7}{2} )^{2} \\ = \frac{22}{7} \times \frac{49}{4} \\ = 11 \times \frac{7}{2} \\ = \frac{77}{2} \\ = 38.5 \: {cm}^{2}$

Answer 2

Answer:

Step-by-step explanation:

परिधि=2πr

22=2×22/7×r

44r=22×7

r=22×7/44

r=7/2 cm

क्षेत्रफल=πr^2

=22/7×7/2×7/2

=77/2 cm^2