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#insyaallah. bnr
luas lingkaran = 3.14*10*10
= 314
luas 1/4 lingkaran =1/4 πr^2
= 1/4*314
= 78,5
luas segitiga = 1/2 *a*T
= 1/2*10*10
=50
luas d arsir .=luas 1/4 lingkaran - lias segitiga
= 78,5-5
= 28.5 (d)
=