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|dw:1353418479537:dw|

how can i solve this one?

well, you'll need to find CD. to do that, note that BDC is a right angle triangle.

how does it became a right triangle?

Well, since it is a tangent, tangents always meet the circle at right angles.

|dw:1353476601742:dw|
so the answer for AD is 22.1 cm??

yh. lol you've got it!

thanks :))

you're welcome :)