Tentukan jari jari lingkaran yg kelilingnya adalah. A.44cm b.57dm

keliling = 2πr
44cm = 2(22/7)r
44cm = (44/7)r
r = 44cm×7/44 = 7 cm

keliling = 2πr
57 cm= 2(22/7)r
57 cm = (44/7)r
r = 57cm × 7/44 = 9,07 cm

keliling lingkaran = 2.Πr
44 = 2. 22/7 . r
44:2 = 22/7 .r
22 = 22/7 . r
7 = r