The construction of plane figures such as triangle, circles, and polygons etc., used in plane geometry is called geometrical constructions.

(i) A Pentagon is that which has five equal sides.

(ii) A hexagon is that which has six equal sides.

(iii) A heptagon is that which has seven equal sides.

(iv) An octagon is that which has eight equal sides.

(v) A nonagon is that which has nine equal sides.

(vi) A decagon is that which has ten equal sides.

(vii) An UN decagon is that which has eleven equal sides.

(viii) A duo decagon is that which has twelve equal sides.

(ix) A diagonal of a polygon is the line joining any two of its angular points.

SCALE

Scale = Size of Drawing / Actual Size