Question

154 cm² क्षेत्रफल वाले वृत की त्रिज्या ज्ञात कीजिए

Answer 1

$\pi {r}^{2} = 154 \\ = {r }^{2} = 154 \times \frac{7}{22} \\ = {r}^{2} = 7 \times 7 \\ = {r}^{2} = 49 \\ = r = \sqrt{49} \\ = r = 7cm \\ \\ \\ circel \: radius \: is \: 7cm \: answer$