Answer:
BC=3root7
CD=root58
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
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