Keliling lapangan berbentuk lingkaran 88 meter tentukan
a diameter,jari2 lapangan
b luas lapangan

2
d= 28, r=14, L= 616
caranya
K = 2πr
88 = 2 x 3,14r
r = 88/6,28
r = 14
d = 14+14 = 28

L = πr2
= 22/7 x 14 x 14
= 616

Jawabanmu

2014-02-12T21:31:06+07:00
A). keliling= 88m 2Πd=88m Πd= 44m d= 44 x 7/22 d= 14 m b) luas= Πr^2 =22/7 . 7^2 =22/7. 49 =22.7 = 154 m^2
2014-02-12T21:33:17+07:00
Diameter = K / π
= 88 : 22/7
= 88 x 7/22
= 25 m

Jari-jari = D/2
= 28/2
= 14 m