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maka panjang titik tengah ke daris dudut siku-siku persegi
20: 2= 10
panjang sisi tegak ?
panjang krangka ?
panjang krangka= 4(sisi tegak ) + 2 (p alas + l alas )
= 4(26) + 2(16+12)
= 104 + 56
= 160