(3x + 10) cm , Dan Lebarnya (x+10) cm. Jika Keliling Persegi Panjang Tersebut 144 cm, Maka Panjang Dan Lebar Persegi Panjang Adalah???

- Bangun Datar -

P = 3x+10 cm
L = x+10 cm

K = 2p + 2l
K = 2(3x+10) + 2(x+10)
K = 6x+20+2x+20
144 = 8x + 40
8x = 144-40
8x = 104
x = 13

P = 3x+10
P = 3(13) + 10 = 49 cm

L = x+10
L = 13+10 = 23 cm

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BANGUN DATAR
PERSEGI PANJANG

p = 3x + 10
l = x + 10

K = 2 (p + l)
144 = 2 (3x + 10 + x + 10)
144 = 2 (4x + 20)
144 = 8x + 40
144 - 40 = 8x
104 = 8x
_______÷8
13 = x

p = 3x + 10
= 3 × 13 + 10
= 39 + 10
= 49 cm

l = x + 10
= 13 + 10
= 23 cm

Semoga bermanfaat ^_^