Question

Plz explain this solution how did it came???

Answer 1

Answer:

see I think they joined B to the inverted B so when u do so the line will touch the principal axis at a point n that point will be the centre or curvature

Answer 2

Answer:

only joín the... B and B'... ..

then the point which join both is C means centre of curvature..

I hope it will help you to understand..☺️

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