Question

Keliling persegi panjang 90 cm.perbandingan lebar dan panjang 2:7.berapa lebar dan panjang berturut-turut...

tolong dijawab..;)

Answer 1

Keliling persegi panjang= 2(p+l)
90=2(7x + 2x)
90=2(9x)
90=18x
90/18= 18x/18
5=x
=>> panjang= 7 x 5= 35
=>> lebar= 2 x 5= 10

Answer 2

K = 90 cm
K = 2 (l+p)
90 = 2 (2x+7x)
90 = 4x + 14x
90 = 18x
x = 90/18
x = 5

Lebar = 2x = 2(5) = 10 cm
Panjang = 7x = 7(5) = 35 cm

Maaf, kalau salah.