Question

Anyone know the answer?

Answer 1

20

Explanation:

Find AC

`\sqrt{65^(2) -16^(2) } = 63`

Substract

63 - AD = 12

Find "?"

`\sqrt{12^(2) +16^(2) } = 20`

Answer 2

Determine AC with the pythagorean theorem, then you can find CD by subtracting AD.

with DC and BC, you can find BD. again, with the pythagorean theorem