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If the radius  of two circles are 4.5 cm and 3.5 cm and the length of the transverse common tangent is 6 cm, then the distance between the two ce
Question

If the radius  of two circles are 4.5 cm and 3.5 cm and the length of the transverse common tangent is 6 cm, then the distance between the two centers will be:

A.

8 cm

B.

10 cm

C.

12 cm

D.

9 cm

Correct option is B

Given:

Radius of the two circles: ( r1_1​ = 4.5 ) cm and ( r2_2​ = 3.5) cm

Length of the transverse common tangent = 6 cm

Formula Used:

Formula for the length of the transverse common tangent:

Length=d2(r1+r2)2\text{Length} = \sqrt{d^2 - (r_1 + r_2)^2}​​

Solution:

6=d2(4.5+3.5)2 6=d282 6=d264 62=d264 36=d264 d2=100 d=10 cm6 = \sqrt{d^2 - (4.5 + 3.5)^2} \\ \ \\ 6 = \sqrt{d^2 - 8^2} \\ \ \\ 6 = \sqrt{d^2 - 64}\\ \ \\6^2 = d^2 - 64 \\ \ \\ 36 = d^2 - 64 \\ \ \\ d^2 = 100 \\ \ \\ d = 10 \text{ cm}

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