1. keliling suatupersegi panjang 72 cm dan lebarnya 8 cm dari panjangnya.hitunglah panjang dan lebarnya!
lailinuradiani
L = 8cm +p K = 2(p+l). =72 cm = 2(p+(8cm+p)) =72 cm = 2p + 16cm +2p=72 cm = 4p +16 cm. = 72 cm = 4p. = (72-16) cm = 4p. = 56 cm = p. = 56/4 = p. = 14 cm jadi,panjang =14 cm maka lebar =8 cm +panjang = 8+14 = 22 cm
K = 2(p+l). =72 cm
= 2(p+(8cm+p)) =72 cm
= 2p + 16cm +2p=72 cm
= 4p +16 cm. = 72 cm
= 4p. = (72-16) cm
= 4p. = 56 cm
= p. = 56/4
= p. = 14 cm
jadi,panjang =14 cm
maka lebar =8 cm +panjang
= 8+14
= 22 cm