terlampir yk_.

terlampir yk_.

K = 2 × (p + l)

94 = 2 × (5x + 2 + 2x + 3)

94 = 2 × (7x + 5)

94 = 14x + 10

14x = 94 – 10

14x = 84

x = 84/14

x = 6

p = 5x + 2

p = 5(6) + 2

p = 30 + 2

p = 32

l = 2x + 3

l = 2(6) + 3

l = 12 + 3

l = 15

L = p × l

L = 32 × 15

L = 480 cm²

:)

a. ukuran panjang dan lebar

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p = 5x + 2

l = 2x + 3

—–

nilai x

K = 2p + 2l

94 cm = 2(5x + 2) + 2(2x + 3)

94 cm = (10x + 4) + (4x + 6)

94 cm = 14x + 10

94 cm – 10 = 14x

84 cm = 14x

x = 6 cm

Diperoleh :

panjang = 5x + 2 = 5(6) + 2 = 32 cm

lebar = 2x + 3 = 2(6) + 3 = 15 cm

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b. luas persegi panjang

$:$

L = p × l

L = 32 cm × 15 cm

L = 480 cm²

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