Question

A regular pentagon is joined to an equilateral triangle whose length of sides is equal to the length of sides of the Pentagon, the figure thus obtained is?

• A. An irregular hexagon
• B. A regular octagon
• C. A regular hexagon
• D. An irregular nanogon

Answer 1

The correct option is C A regular hexagon

In given figure $ABCEF$ is a regular pentagon whose length of sides are equal.

Also, $CDE$ is an equilateral triangle whose side's length is same as the length of the side of pentagon $ABCEF$.

When we join this two figures, we get a polygon having $6$ equal sides.

$\therefore$ Polygon $ABCDEF$ is a regular hexagon.