Keliling sebuah persegi panjang 56m. jika panjang nya (x+5)m dan lebarnya (x-5)m

PEMBAHASAN

K = 56 m

K = 2 × (p + l)

K = 2 × (x + 5 + x – 5)

K = 2 × 2x

K = 4x

56 m = 4x

56 m : 4 = x

14 m = x

panjang = x + 5 m

panjang = 14 m + 5 m

panjang = 19 m

lebar = x – 5 m

lebar = 14 m – 5 m

lebar = 9 m

L = p × l

L = 19 m × 9 m

L = 171 m²

mapel : Matematika

semoga membantu

!=NO COPAS=!

Jawaban:

K = 2 (p + l)

56 = 2 (x + 5 + x – 5)

56 = 2 (2x)

56 = 4x

x = 14

p = 19

l = 9

L = p × l = 19 × 9 = 171