Please solve q 71 ?

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1 Answer
May 13, 2018

#3/4x#

Explanation:

#C_1P_1=x , PQ=7x# as per your drawing
The two diameters #PP_2 # and #P_1Q# are #3.5x# each therefore the radii #PC_1# and #C_2Q# are#3.5/2x# each.

Putting these together we have
#7/4x +x+P_1P_2+x+7/4x=7x#

#P_1P_2=3/2x#

So the radius #=3/4x#