tolong di jawab ya ka,, tolong bgt ka

K = 2(P + l)
82 cm = 2(4x+9) + 2(5x-4)
82 cm = 8x + 18 + 10x -8
82 cm = 18x + 10
82-10 = 18x
72 cm = 18x
4 = X

Panjang = 4x + 9
= 4×4 + 9
= 25 cm.
Lebar = 5x-4
= 5×4 -4
=16 cm.

Luas = P × l
= 25 cm × 16 cm
= 400 cm² ( c )