anonymous
  • anonymous
Pleaaaase help me! What is the radius (r) of a circle inscribed in a "12-16-20" right triangle? The answer must be either a whole number, in reduced fraction form, or simplified radical form (no decimals). I can't paste the picture here but what it basically looks like is a right triangle with the two legs being 16 and 12 and the hypotenuse being 20. Inside the triangle is a circle and there is one radius line drwan in it...
Mathematics
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anonymous
  • anonymous
Pleaaaase help me! What is the radius (r) of a circle inscribed in a "12-16-20" right triangle? The answer must be either a whole number, in reduced fraction form, or simplified radical form (no decimals). I can't paste the picture here but what it basically looks like is a right triangle with the two legs being 16 and 12 and the hypotenuse being 20. Inside the triangle is a circle and there is one radius line drwan in it...
Mathematics
jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
if you connect the angles with the midpoint of the opposite sides, you find the center of the triangle.... that much I have so far :)
anonymous
  • anonymous
What do you know about incentres/incircles? I guess nothing, as then this would be trivial :/
amistre64
  • amistre64
I come to radius=4. If we take the intersection of the lines as the center for our circle, then y = 4... if I did it right :)

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anonymous
  • anonymous
You are right.. In general, the radius is (xy)/(x+y+z) - where z = hypotenuse.
amistre64
  • amistre64
y = (3/8)x and y = -(3/4)x + 12 is what I used
amistre64
  • amistre64
yay!!... im glad I was right :) thanx
anonymous
  • anonymous
I like your method, by the way. I've seen others answer questions like that with lines rather than geometric rules, and it always surprises me - I never spot to do things like that :(
amistre64
  • amistre64
x = 32/3 which when plugged in gets me y = 4 :)

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