Question

Two circles of radii 5.5 cm and 4.2 cm touch each other externally. Find the distance between their centres.

Answer 1

Hi ,

Let R and r are radii of two circles.

R = 5.5 cm , r = 4.2 cm

If two circles touch externally then,

the distance between two centres

D = R + r

D = 5.5 cm + 4.2 cm

D = 9.7 cm

I hope this helps you.

: )

Answer 2

Heya !!



Radius of first circle ( R1 ) = 5.5 cm


And,

Radius of second circle ( R2 ) = 4.2 cm



Therefore,


Distance between their centres = R1+R2


=> 5.5 + 4.2


=> 9.7 cm