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3.
22/7.d = 66
d = 66.7/22
= 21
L =
22/7× 10,5 × 10,5
= 346.5
5. sudut AOD = 80° (sudut pusat.)
sudut ACB = ? (sudut keliling).
sudut AOB = 180 - 80 = 100°
sudut ACB = 100 ÷ 2 = 50°
jadi jawabannya B.
maaf kalo salah
semoga membantu :)