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panjang : 4/7 x 42 = 24 cm
lebar : 3/7 x 42 = 18 cm
maka keliling : 2p + 2l
: 2x24 + 2x18
: 48 + 36
: 84 cm
Semoga membantu ... :-)
K = 2*(p+l)
42 = 2*(4x+3x)
42 = 2*7x
7x = 42/2
7x = 21
x = 21/7
x = 3
p = 4x
= 4*3 = 12 cm
l = 3x
= 3*3 = 9 cm
L = p*l
= 12 * 9
= 108 cm²
Semoga membantu :)