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= πd + 9d
= 22/7 * 42 + 9 * 42
= 132 + 378
= 510 cm
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luas segitiga = 1/2 * a * t
1/2 at = 240
1/2 * 16 * t = 240
8t = 240
t = 240 / 8
t = 30 cm
22/7 × 2 × 21 = 132 +
510
no 28 kurang tahu