d=10,5 cm
karena yg diketahui d,luasnya pake 1/4πd^2,tapi kalau pake πr^2 juga gapapa hasilnya sama.
luas 1/2 lingkaran
=1/2x1/4πd^2
=1/2x1/4x3,14x10,5^2
=1/8x3,14x110,25
=43,27
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= 3,14 × 5,25×5,25 ( dibagi 2)
= 3,14 ×27,5625
=86,546/2 =43,273
d=10,5 cm
karena yg diketahui d,luasnya pake 1/4πd^2,tapi kalau pake πr^2 juga gapapa hasilnya sama.
luas 1/2 lingkaran
=1/2x1/4πd^2
=1/2x1/4x3,14x10,5^2
=1/8x3,14x110,25
=43,27