What will be the next figure?

To determine the next figure in the sequence, observe the pattern of shapes changing from left to right:
The pattern shows that the first shape progresses from a triangle (3 sides) to a square (4 sides) to a pentagon (5 sides). The next logical shape in the sequence should have 6 sides, which is a hexagon. The circle remains constant in each figure.
Thus, the next figure should contain a hexagon and a circle. The correct answer corresponds to this logic:

In the following question, select the missing number from the given series.
5, 10, 17, 26, 37, ?, 65
In the following question, select the missing number from the given series.
5, 10, 17, 26, 37, ?, 65
Identify the figure that best fits in place of the question mark.

Which of the following figures will complete the figural series given below?
