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## what is a circumcenter of a tetrahedron???

Asked by Anushri 10th November 2013 11:10 PM

## Three circles of radii 1, 2 and 3 units respectively touch each other externally in the plane. The circumradius  of the traingle formed by joining the centers of the circles is a)  1.5              b) 2                  c)  2.5              d) 3

Asked by Anil 22nd August 2017 9:21 PM

## If a is any vector then prove that a=(a.i)+(a.j)j+(a.k)k.

Asked by sunil2791 21st November 2017 6:04 PM

## How can we find out foot of perpendicular and image of a point in plane ? Gow can we find out equation of plane passing through 2 planes?

Asked by Vishal 21st November 2017 10:50 PM

## If a+b+c=0 and |a|=3, |b|=5, |c|=7, find the angle between a and b.

Asked by sunil2791 24th November 2017 7:20 PM