Question

If two circles with radius a cm and b cm meet externally., then the distance between their centres is equal to ______ cm.

• A. $a+b$
• B. $a-b$
• C. $a\times b$
• D. $\frac{a}{b}$

Answer 1

The correct option is A $a+b$

As the circles touch each other externally, the distance between the centres of circles is equal to the sum of their radii.
Thus, the distance between their centres = a + b cm.