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luas = s²
luas = 10²
luas = 100
luas setengah lingkaran
1/2 x phi x r²
1/2 x 3,14 x 10²
1/2 x 3,14 x 100
1/2 x 314
157
maka luas bangun itu
100 + 157 = 257(c)