Keliling suatu lingkaran 176 tentukan diameter nya

Jawab:

176 = 2 . phi . r

176 = 2 . 22/7 . r

176 = 44/7 . r

r = 176 : 44/7

r = 176 . 7 / 44

r = 4 . 7

r = 28

maka d = 28 . 2 = 56