Roda Mobil devan berdiameter 49 cm a. Berapa jari jarinya b. Berapa luasnya C. Berapa kelilingnya

a. Jari-jari (r) = 1/2 x d = 1/2 x 49 = 24,5 cm
b. Luas = [tex] \pi [/tex] x r x r = 22/7 x 24,5 x 24,5 = 1.886,5 [tex] cm^{2} [/tex]
c. Keliling = [tex] \pi [/tex] x d = 22/7 x 49 = 154 cm
                

jari jari = 24,5
luas = 1/4 × phi × d × d
1/4 × 22/7 × 49×49=1886,5
keliling= 2×phi×d
2×22/7×49 = 308