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How many external tangents are there for two circles?

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How many external tangents are there for two circles?

(a) 1

(b) 2

(c) 3

(d) 4

I got this question during a job interview.

I want to ask this question from Drawing Tangents and Normals for Different Conditions of Circle topic in chapter Geometrical Construction of Engineering Drawing

1 Answer

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Best answer
Right choice is (b) 2

Explanation: External tangents are those which touch both the circles but they will not intersect in between the circles. The tangents touch at outmost points of circles that are ends of diameter if the circles have the same diameter.

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