Respuesta :

yinaanna0

Answer:

BC=3root7

CD=root58

Step-by-step explanation:

According to Pythagorean theorem, in a right triangle,a^2+b^2=c^2. a, b are two legs of right triangle. Cis the hypotenuse

12^2-9^2=63

BC=root63=3root7

BD^2-BC^2=CD^2

121-63=CD^2

CD=root58