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Luas=24x15:2
=15cm+15cm+15cm+15cm=60cm
b.d1=24cm
d2=√15^2-(24:2)^2
=√15^2-12^2
=√225-144
=√81
=9cm
Luas=d1×d2:2
=24cm×9cm:2
=108cm2
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