SOLUTION: Two joining chords in a semicircle have lengths 1 cm and 2 cm, as shown. Find the exact radius, r cm, of the semicircle. http://imgur.com/KWNd6Ba Please show all working out.

Question 1021280: Two joining chords in a semicircle have lengths 1 cm and 2 cm,
as shown. Find the exact radius, r cm, of the semicircle.
http://imgur.com/KWNd6Ba
Please show all working out. Thank you.
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
Some knowledge to know about that kind of triangle with one segment the diameter of the circle is that it is a RIGHT triangle, and the drawing includes a reminder marking to tell you that.

Side lengths: r+r, 1, and 2.
Hypotenuse: 2r.

-------starts with Pythagorean Theorem Formula.
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