Question

Bantuin kerjain dong nomor 13?

Answer 1

Panjang = x + 2
lebar = x

keliling = 2(p+l)
28 = 2(x+2+x)
28 = 2 (2x + 2)
28 = 4x + 4
28-4= 4x
24 = 4x
x = 24/4
x = 6

panjang = x + 3  = 6 +  2= 8 cm
lebar = x = 6 cm

luas = p x l
luas = 8 x 6
luas = 48 cm² (C)