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42 = 2 x 5a + 2 x 2a
42 = 10a + 4a
42 = 14a
a = 3
Luas
panjang x lebar
5(3) x 2(3)
15 x 6
90 cm2
lebar = 2x
K = 2(p+l)
42 = 2(5x+2x)
21 = 7x
x = 21/7
x = 3
L = p.l
= 5x.2x
= 5.3 .2.3
= 15 . 6
= 90 cm²