Draw the diagram. You can see that there is a right triangle formed by DCA with the legs being DC and AC. You can find AD, the hypotenuse of the right triangle (side opposite the right angle) using Pythagorean Theorem.
Doug C.
Using coordinate geometry I have figured that AD = 9, but so far no clue how to do using geometry.
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06/20/22
Doug C.
Whoops not correct, got my letters in the wrong order, back to drawing board.
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06/20/22
Doug C.
Got letters in correct order and AD still equals 9.
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06/20/22
JACQUES D.
tutor
Sorry, read as = 90. Thx for correction.
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06/20/22
Doug C.
Angle DCA is less than 90. So no right triangle there.06/20/22