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CBSE Class 11-science Answered

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 | 22 Aug, 2017, 09:21: PM
answered-by-expert Expert Answer
 
begin mathsize 16px style If space you space draw space the space diagram space you space will space get space straight a space triangle space
after space joining space the space centres space which space is space right space angle space triangle space of space sides space 3 comma 4 comma 5. space
Find space circum space radius space using space formula space
straight d equals fraction numerator abc over denominator 2 cross times area end fraction equals 5
rightwards double arrow straight r equals 2.5 end style
 
Answered by Sneha shidid | 06 Dec, 2017, 11:11: AM
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