Panjang sisi suatu persegi panjanh adalah 2½cm dan 3 2/5 cm.berapa cm luas dan keliling

K = 2(p+l)
K = 2(3 2/5 + 2½)
K = 2(5 + 4/10 + 5/10)
K = 2(5 + 9/10)
K = 10 + 9/5
K = 10 + 4½
K = 14½ cm


L = p × l
L = 2½ × 3 2/5
L = 5/2 × 17/5
L = 17/2
L = 8½ cm²