Pertanyaan
sebuah persegi panjang mempunyai panjang (3x+5)cm dan lebar (2x-2)cm.jika keliling persegi panjang tersebut 56 cm, maka luasnya adalah
Ditanyakan oleh: USER5633
134 Dilihat
134 Jawaban
Jawaban (134)
k = 2p + 2l
56 = 2(3x+5) + 2(2x-2)
56 = 6x + 10 + 4x - 4
56 = 10x + 6
10x = 56 - 6
10x = 50
x = 50/10
x = 5
p = 3x + 5
p = 3(5) + 5
p = 15 + 5
p = 20 cm
l = 2x - 2
l = 2(5) - 2
l = 10 - 2
l = 8 cm
L = p x l
L = 20 x 8
L = 160 cm²
56 = 2(3x+5) + 2(2x-2)
56 = 6x + 10 + 4x - 4
56 = 10x + 6
10x = 56 - 6
10x = 50
x = 50/10
x = 5
p = 3x + 5
p = 3(5) + 5
p = 15 + 5
p = 20 cm
l = 2x - 2
l = 2(5) - 2
l = 10 - 2
l = 8 cm
L = p x l
L = 20 x 8
L = 160 cm²
K= 2 ( p + l )
56= 2((3x+5)+(2x-2))
56=2(3x+5+2x-2)
56=2(5x+3)
56=10x+6
56-6=10x
50=10x
50/10=x
5=x
p=3x+5=3.5+5=20
l=2x-2=2.5-2=8
L=p x l=20 x 8=160cm²
56= 2((3x+5)+(2x-2))
56=2(3x+5+2x-2)
56=2(5x+3)
56=10x+6
56-6=10x
50=10x
50/10=x
5=x
p=3x+5=3.5+5=20
l=2x-2=2.5-2=8
L=p x l=20 x 8=160cm²