Question

How many are simple curves?

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

The correct option is D 5

A simple curve is a curve in which any two lines intersect at one point only and the lines enclose a single area.

In $\left(3\right)$, there are two areas formed by two circles.

In $\left(4\right)$, there are more than one areas formed by the figure.

In $\left(8\right)$, there are $2$ area formed by two circles.

Thus, figures $1,2,5,6,7$ are simple curves.

Hence, there are $5$ simple curves.