Diketahui persegi panjang. panjangnya (2x+5) cm dan lebar (4x - 10) cm .Jika keliling sebenarnya 26 cm. panjang dan lebar persegi panjang berturut turut adalah a.11 cm dan 2 cm b.10 cm dan 3 cm c.9 cm dan 4 cm d.8 cm dan 5 cm
Ikwanwan
K = 2(p + l) 26 = 2(2x + 5 + 4x - 10) 13 = 6x - 5 6x = 18 x = 18/6 x = 3
panjang = 2x + 5 = 2(3) + 5 = 6 + 5 = 11 cm lebar = 4x - 10 = 4(3) - 10 = 12 - 10 = 2 cm jawabannya A.
0 votes Thanks 7
mvaren
Panjang = ( 2x + 5 ) cm Lebar = ( 4x - 10 ) cm Keliling = 26 cm
26 = 2(2x + 5 + 4x - 10)
13 = 6x - 5
6x = 18
x = 18/6
x = 3
panjang = 2x + 5 = 2(3) + 5 = 6 + 5 = 11 cm
lebar = 4x - 10 = 4(3) - 10 = 12 - 10 = 2 cm
jawabannya A.
Lebar = ( 4x - 10 ) cm
Keliling = 26 cm
Rumus Keliling = 2 × ( Panjang + Lebar )
Jawab :
2 × ( 2x + 5 + 4x - 10 ) = 26
2 × ( 6x - 5 ) = 26
12x - 10 = 26
Cari nilai x
12x - 10 = 26
12x = 26 + 10
12x = 36
x = 3
Maka, Panjang = ( 2 × 3 + 5 ) = 11 cm
Lebar = ( 4 × 3 - 10 ) = 2 cm
Maka, Jawabannya adalah 11 cm dan 2 cm ( A )