Question

Помогите пожалуйста

Answer 1

Ответ:

AB^2 = AC^2 + BC^2

BC^2 = DC^2 + BD^2 => BC^2 = DC^2 + 256

AC^2 = DC^2 +AD^2 => AC^2 = DC^2 + 81

625 = 2*DC^2 + 256 + 81

2*DC^2 = 625 - 256 - 81 = 288

DC^2 = 288:2 = 144

DC = √144 = 12

следовательно

BC^2 = 144 + 256 =. 400

BC = 20

AC^2 = 144 + 81 =. 225

AC = 15

P = AC + BC + AB = 15 + 20 + 25 = 60 см