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1/2 x 6 x 10
= 30 cm²
2. 15 dan 18
1/2 x 15 x 18
= 135 cm²
=1\2 d1.d2
=1\2 6.10
=1\2 60=30cm
-15cm dan 18cm
=1\2 d1.d2
=1\2 15.18
=1\2 270=135cm