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Misal a = 3x b=5x. c=7x k= a + b +c 90 = 3x + 5x + 7x 90 = 15 x x = 90/15 = 6 a= 3x = 3.6= 18 b = 5x = 5.6=30 c=7x=7.6 = 42 jd sisi terpendek = 42 cm L = 1/2 x alas x tinggi = 1/2 x c x t = 1/2 x 42 x 11 = 231 cm^2
k= a + b +c
90 = 3x + 5x + 7x
90 = 15 x
x = 90/15 = 6
a= 3x = 3.6= 18
b = 5x = 5.6=30
c=7x=7.6 = 42
jd sisi terpendek = 42 cm
L = 1/2 x alas x tinggi
= 1/2 x c x t
= 1/2 x 42 x 11
= 231 cm^2