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klo luas persegi 169 berarti sisinya 13
keliling = 13 x 4 = 52
lebar persegi panjang= 52:2-15 = 11
luas persegi panjang = pxl = 15 x 11 = 165 cm2
b.
kel persegi = kel persegi panjang
4 x s = 2p + 2l
4 x 13 = 2(15) + 2l
52 =30 + 2l
2l = 22
l = 11
Luas persegi panjang = p x l = 15 x 11 = 165