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= 1/2 (15 + 3x + 2)
= 1/2 (17+3x)
150 = 8,5 + 3/2x
150 - 8,5 = 3/2x
141.5 = 3/2x
141.5 * 2/3 = x
94,3 = x
3x + 2 = 3.(94,3) + 2
= 282.9 + 2
Panjang Diagonal Kedua = 284, 9 cm
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