Question

Tolong di jawab!!
diketahui keliling persegi panjang = 90 cm. Perbandingan panjang dan lebarnya = 5 : 4. tentukan Luasnya??

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Answer 1

Keliling = 2(p+l)
(p+l)= 90/2
(p+l) = 45 cm
Panjang = 5 / 5+4 x 45
= 5/9 x 45 = 25 cm
Lebar = 4/9 x 45 = 20 cm
Luas = pl
Luas = 25 . 20
Luas = 500 cm2

Answer 2

Keliling = 2p + 2l
90 = 2(5) + 2(4)
90 = 10 + 8
90 = 18
90/18 = 18/18
5 = 1
panjang = 25. lebar = 20.
luas = 500