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qr = 5/4 pr
nah kita misalkan pr = x maka
qr = 5/4 x
pq = 3/5 * (5/4 x) = 3/4 x
Kell = 18 cm
pr + qr + pq = 18
x + 5/4 x + 3/4 x = 18
(1 + 5/4 + 3/4) x = 18
(4/4 + 5/4 + 3/4) x = 18
(12/4) x = 18
3x = 18
x = 6 cm
maka
pq = 3/4 x = 3/4 * 18 = 13,5 cm
qr = 5/4 x = 5/4 * 18 = 22,5 cm
luas = 1/2 * 6 * 13,5 = 40,5 cm²