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L=A×T=12×5=B. 60cm2
No. 7
L=(P×L) + (1/2×Jumlah sisi sejajar×T)
=(30×90)+(1/2×90×15)
=2700+675
=B. 3.375cm2
No. 8
L=2×(1/2×Jumlah sisi sejajar×T)
=2×(1/2×36×6)
=2×108
=D. 216cm
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