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PQ= akar 39^2 - 36^2
=akar 1521-1296
=akar 225
=15
panjang sisi AB = 15 × 2
=30
luas alas = 1/2 × 30 × 36
=540
luas alas = sisi × sisi
=30×30
=900
a. keliling persegi
=4 × sisi
=4 × 30
=120
b.luas limas
=luas alas + 4 × luas sisi
=900 +4 × 540
=3060