ꯁꯔꯀꯜ ꯑꯃꯗꯥ ꯑꯦꯔꯤꯌꯥ $154$ cm² ꯂꯩ꯫ ꯃꯁꯤꯒꯤ ꯁꯔꯛꯌꯨꯏꯐꯦꯔꯦꯟꯁ ($\pi = \dfrac{22}{7}$ ꯂꯧꯕꯥ) ꯈꯪꯗꯣꯀꯎ꯫

$\pi R^2 = 154$ꯗꯒꯤ: $R^2 = \dfrac{154 \times 7}{22} = 49 \;\Rightarrow\; R = 7$ ꯁꯦ.ꯃꯤ. ꯁꯔꯛꯌꯨꯏꯐꯦꯔꯦꯟꯁ $= 2 \pi R = 2 \times \dfrac{22}{7} \times 7 = 44$ ꯁꯦ.ꯃꯤ.