Ask a New Question

Question

A polygon has 20 diagonals .how many sites it have?

ans 8 BUT HOW DO WE GET IT


14 years ago

Answers

Ms. Sue
http://www.mathsisfun.com/geometry/regular-polygons.html

14 years ago
Hamza
Even i don't know but just memorize the formula n(n-3)/2 = No of diagonals.
Where n is the number of sides
9 years ago

Related Questions

What polygon has 20 diagonals?I don't know how to figur this out. THANKS!!!! A rectangle (4 sides... A polygon has d diagonals. If the polygon had one more side, it would d + 10 diagonals. How many sid... what polygon has 9 diagonals? If all of the diagonals are drawn from a vertex of a quadrilateral, how many triangles are formed? The diagonals of a rhombus are 16cm and 10 cm. Calculate the angles of the rhombus. The diagonals of a rhombus are in the ratio 3:4. If its perimeter is 40 cm, find the lengths of th... If all of the diagonals are drawn from a vertex of a pentagon, how many triangles are formed? how many diagonals are there in a hendecagon? The diagonals are (perpendicular, parallel) lines AC and BD are diagonals of ABCD. what value of x makes ABCD a rectangle if AC = x + 7 and BD =...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use