An octagon is cut into 8 isosceles triangles as shown in the diagram by joining all its diagonals.Further, three concentric circles are drawn from the centre of the octagon in such a way that all the circles are inside the octagon. Thus, the octagon is divided in 32 small parts. It is filled using numbers from 11 to 99 (used at most once) in the following manner:

Six identical triangles can be formed by drawing two straight lines through an octagon's center point.

Which statement about a regular octagon is TRUE?It has nine sides.It has eight angles of equal measure.It has seven sides.Two of the sides in an octagon do not connect.

How many lines of symmetry does a regular octagon have?A.8B.NoneC.4D.2

A regular octagon with sides of length 11 and an apothem of length 8.85 has an area of _____ square units.A.98.65B.778.80C.430.77D.389.40E.121F.97.35

The octahedron can be constructed from the repetitive folding of _____.A.trianglesB.equilateral trianglesC.regular pentagonsD.squares