Plis,tolong bantuin nomor ini 3dan 4 plis​

Jawaban:

3.

p = 2x-6

l = x+4

keliling persegi panjang = 2×(p+l)

52 = 2×(2x-6+x+4)

52/2 = 3x-2

26+2 = 3x

28/3 = x

p = 2(28/3)-6

= (56/3)-6

= 56/3 – 18/3

= 38/3

l = (28/3)+4

= 28/3 + 12/3

= 40/3

luas = p×l

= 38/3 × 40/3

= 1520/9

= 168,89 cm²

4.

luas diarsir = 16cm²

sisi diarsir = √16 = 4cm

luas tidak diarsir

= luas persegi panjang – luas diarsir

= p×l – 16

= 14×9 – 16

= 126-16

= 110 cm²