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K = 90 cm
panjang = 5 + l
maka :
K = 2 x (p+l)
90 = 2 x (5+l+l)
90 = 2 x (5+2l)
90 = 10+4l
4l = 90-10
l = 80/4
l = 20 cm
jadi lebar = 20 cm
panjang = 20 + 5 = 25 cm
Keliling = 90 cm
panjang = 5 cm + x cm
lebar = x cm
Ditanya = Lebar persegi panjang tersebut?
Jawab =
Keliling = 2(p+l)
= 90 cm
p+l = 90 cm : 2
= 45 cm
= (5+x) + x = 45 cm
5+2x = 45
2x = 45-5
2x = 40
x = 20
lebar = x
= 20 cm