Tolong di kerjain pakai cara, makasih

Mapel : Matematika
bab : Dalil Phythagoras

DB = Akar DA^2 + AB^2
DB = Akar 12^2 + 9^2
DB = Akar 144 + 81
DB = Akar 225
DB = 15 cm

BC = Akar DC^2 - DB^2
BC = Akar 25^2 - 15^2
BC = Akar 625 - 225
BC = Akar 400
BC = 20 cm

K = DA + AB + BC + CD
K = 12 + 9 + 20 + 25
K = 66 cm

( C )