Jawabanmu

2014-09-02T17:45:55+07:00
Diket: Luas lingkaran = 70.650m2, Luas lingkaran = (22/7)r2 = (3,14)r2, maka:
L=(3,14)r2 = 70.650
r2 = 70.650/(3,14) = 22.500
jari2 (r) = akar kuadrat 22.500 = 150m, jadi:
a. Diameter waduk = 2r = 2(150) = 300m
b. Keliling waduk = 2(3,14)r = 2(3,14)150 = 942m
c. Banyaknya pohon = 942/6m = 157 pohon  
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