Question

Define:-

concave polygon

convex polygon

Diagonals

Answer 1

1. CONCAVE POLYGON: A concave polygon will always have at least one reflex interior angle—that is, an angle with a measure that is between 180 degrees and 360 degrees exclusive

2. CONVEX POLYGON: A convex polygon is defined as a polygon with all its interior angles less than 180°. This means that all the vertices of the polygon will point outwards, away from the interior of the shape. Think of it as a 'bulging' polygon. Note that a triangle (3-gon) is always convex.

3. DIAGONALS: a diagonal is a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge. Informally, any sloping line is called diagonal.

Answer 2

Concave polygon:

If at least one angle of a polygon is more than 180°, then it is called a concave polygon.

Convex polygon:

If each of the interior angles of a polygon is less than 180°, then it is called convex polygon.

Diagonal:

A diagonal is a line segment that links two vertices of a polygon that are not adjacent.