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KLL = 2 (p+l)
40 = 2(p+l)
40/2 = p+l
p+l = 20
p : l = 3 : 2 , 2+3 = 5
l = 2/5 * 20 = 40/5 = 8 cm
17)
L = diagonal1 x diagonal2 x 1/2
216 = 18 x diagonal x 1/2
216 = 9 x diagonal
diagonal = 216/9 = 24 cm