30) luas juring=144/360×3.14×10×10
= 144/360×314
=125,6 (D)
31)102° dibagi 3 = 34°
AOB=34×2=68(B)
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30) luas juring=144/360×3.14×10×10
= 144/360×314
=125,6 (D)
31)102° dibagi 3 = 34°
AOB=34×2=68(B)