tolong jawab no 8 sama minta pin sama line

panjng = x + 5 cm
lebar = 2x - 3 cm

keliling = 40 cm

ditanya: luas??

keliling = 2p + 2l
40 = 2(x+5) + 2(2x-3)
40 = 2x + 10 + 4x - 6
40 = 6x + 4
6x = 40-4
6x = 36
x = 6

panjang = x+5 = 6+5 = 11 cm
lebar = 2x-3 = 2(6)-3 = 12-3 = 9 cm

luas = p × l
luas = 11 × 9
luas = 99 cm²

#maaf kalo ad kesalahan