What is the measure of the radius of the circle that circumscribes a triangle whose sides measure 5, 12 and 13?
Choices.
A) 2.5
B) 6.5
C) 5
D) 6.0
E) 7
Some of pyhtagron triplets we need to keep it in mind.   Like {( 2,3,5) , ( 5,12,13) ,( 7, 24,25), ( 11, 60,61).   So now we know the triangle is an right angle triangle. The circle circumscribes the triangle.   The circumraduis of the circle that circumscribes the right angle triangle = hypotanse / 2 = 13 / 2= 
<gadget id="calculator">13 / 2</gadget>
<output>13/2 = around 6.5</output>
6.5   Ans. 6.5
<result>B</result>
What is the measure of the radius of the circle that circumscribes a triangle whose sides measure 5, 12 and 13?