Jawabanmu

2014-06-16T12:43:36+07:00
No 1
L= \pi  r^{2}  \\ L=3,14 X 15 X 15 \\ L=706,5  cm^{2}

no 2
luas kolam = luas persegi panjang + luas 1/2 lingkaran
=(pxl) + ( \frac{1}{2} \pi  r^{2}) \\ =(50x20) + ( \frac{1}{2}x3,14x10x10) \\ =1000 + 157 \\ =1157 m^{2}