Q: How many lines connect a regular pentagon with every other corner?

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Every pentagon, regular or not, has five interior angles and five exterior angles.

10. or 45. depending on if we're connecting them to adjacent corners or to every other corner

In geometry, "regular" means all the sides are the same (and all angles the same). A regular pentagon has all 5 sides the same. Some pentagons have every side different; other irregular pentagons have 2, 3, 4, or 5 sides the same.

A 'concave decagon' is a ten-sided shape with every other corner pushed in towards the centre. It forms a regular five-pointed star.

It is a polyhedron with a pentagonal base. To every side of the pentagon are attached triangles that meet at a single point in a plane higher than the pentagon (if it is a skew pyramid, the apex will not be above the pentagon).

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No. But if you restrict yourself to regular pentagons, then all regular pentagons are similar.

Every pentagon, regular or not, has five interior angles and five exterior angles.

A pentagon has 5 sides.A regular pentagon has every side the same length.Perimeter = 5 x 3s= 15 s(whatever unit a s is, other than a second.)

You can't have a rectangular pentagon. Perhaps you mean regular? In any case every pentagon has 5 sides ("penta" = "five")

Not necessarily. Every side of a regular pentagon is the same length, but there is an infinite variety of irregular pentagons in which no two sides are the same length.

10. or 45. depending on if we're connecting them to adjacent corners or to every other corner

A regular pentagon has 5 lines of symmetry, running from each vertex to the midpoint of the opposite side. These lines are not to be confused with the five lines it takes to draw a pentagon. Every regular polygon has as many lines of symmetry as there are lines in the polygon.An irregular pentagon may have none or 1 line of symmetry.

All five interior angles of a pentagon always add up to 540 degrees, but there'sno way to tell what each one is.In a regular pentagon, every interior angle is 108°.

In geometry, "regular" means all the sides are the same (and all angles the same). A regular pentagon has all 5 sides the same. Some pentagons have every side different; other irregular pentagons have 2, 3, 4, or 5 sides the same.

A 'concave decagon' is a ten-sided shape with every other corner pushed in towards the centre. It forms a regular five-pointed star.