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lebar = x
panjang diagonal = 30
luas?
mencari lebar dulu.
lebar = panjang diagonal pangkat 2 - panjang pangkat 2
lebar = (30×30)-(24×24)
lebar = 900 - 576
lebar = 324
lebar = 18 *akar dari 324
panjang = 24
lebar = 18
luas = panjang × lebar
luas = 24 × 18
luas = 432 cm persegi