ABC ia a right triangle right angles at B with side length |AB|=25, |BC|=50. If DBEF in the diagram is square, what is the area of DBEF
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Answer:
AB = 5 cm, BC = 12 cm
Using Pythagoras theorem,
AC2=AB2+BC2
= 52+122
= 25+144
= 169
AC=13.
We know that two tangents drawn to a circle from the same point that is exterior to the circle are of equal lengths.
So, AM=AQ=a
Similarly MB=BP=b and PC=CQ=c
We know
AB=a+b=5
BC=b+c=12 and
AC=a+c=13
Solving simultaneously we get a=3,b=2 and c=10
We also know that the tangent is perpendicular to the radius
Thus OMBP is a square with side b.
Hence the length of the radius of the circle inscribed in the right angled triangle is 2cm.
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