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If the radius of the circumcircle of an equilateral triangle is 10 cm, then what will be the radius of the incircle inscribed in it?

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Important Questions on Geometry

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UPSC CDS
IMPORTANT
In the ABC the medians CD and BE intersect each other at point O then the ratio of the area of ODE and ABC will be:
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UPSC CDS
IMPORTANT
Point O is the centroid of ABC and AD, BE and CF are its medians. If area of AOE=15 cm2, then the area of quadrilateral BDOF is:
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UPSC CDS
IMPORTANT
The radii of two concentric circles are 9 cm and 15 cm. If a chord of the bigger circle is tangent on the smaller circle then the length of that chord is:
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UPSC CDS
IMPORTANT
Point O and C are the orthocentre and the circumcentre of an actute angle triangle PQR respectively. When points P and O are joined and produced it intersects side QR at point S. If PQS=60° and QCR=130°, then RPS is:
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UPSC CDS
IMPORTANT
The length of a chord of a circle is equal to its radius. The value of the angle subtended by this chord at the centre of the circle is:
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UPSC CDS
IMPORTANT
In ABC, AD is the internal bisector of A and it meets with side BC at point D. If BD=5 cm, BC=7.5 cm, then AB:AC is:
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UPSC CDS
IMPORTANT
A chord of circle with radius 5 cm is the tangent to a circle with radius 3 cm long. If these two circles are concentric, then the length of that chord is:
EASY
UPSC CDS
IMPORTANT
Point O is the incentre of ΔABC and A=30°. Then value of BOC is: