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162=a×2a
162=2a²
a²=81
a=9
alas=a
=9
tinggi=2a
=2×9
=18
panjang sisi lainnya =13.5
keliling= 2×(alas+sisi lainnya)
=2×(9+13.5)
=18+27
=45 cm
maaf kalau salah