how many diagonals are there in a hendecagon?

What polygon has 20 diagonals?I don't know how to figur this out. THANKS!!!! A rectangle (4 sides...

The diagonals of a rhombus have lenghts 16 and 30. Find the perimeter of the rhombus.

a chessboard has diagonals of lengths 40 m. what is the length of each side of the board, to the n...

the diagonals of a parellelogram are 20 cm and 30cm long and intersect at an angle of 25 degrees. Fi...

if the diagonals of a parallelogram are equal then the parallelogram is also what type of figure?

the diagonals of an isosceles trapezoid are each 17,the altitude is 8,and the upper base is 9.Find t...

How many diagonals does a quadrilateral have?

A drawing of diagonals for four different polygons is listed below. What is the number of diagonals...

If all of the diagonals are drawn from a vertex of a quadrilateral, how many triangles are formed?

If all of the diagonals are drawn from a vertex of a pentagon, how many triangles are formed?

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