Radii of two circles are 12 cm and 5 cm. Distance between their centres is 25 cm. What is the length of the direct common tangent ?
Answer & explanation
Correct answer: option 2
Formula to be used
√{D2 -(r1 – r2) 2}
⇒ AC = radius of smaller circle
⇒ BD = radius of bigger circle
According to the formula
⇒ Length of CD = √{252 -(12 – 5) 2}
⇒ \(\sqrt {576 }\) = 24 cm.