Tolong dijawab No 10
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1/4× 3, 14×10×10 = 78,5cm^2
luas segitiga = axt :2 = 10×10:2 =50 cm^2
luas 1/2 arsiran = luas 1/4lingk-luas sgtiga
= 78,5-50 = 28, 5 cm^2
luas srluruh arsiran = 2×luas 1/2 arsiran
= 2× 28,5 = 57 cm^2(D)