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Because it has only 3 sides and a polygon must have 4 or more sides to have diagonals. A diagonal of a polygon is a line segment which connects two non-adjacent vertices. Since from any vertex of a triangle, you are adjacent to both of the other vertex, there are not any non-adjacent vertices.
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If you draw one diagonal inside a pentagon what two shapes are formed?
triangle and trrapezium
What is a polygon with no diagonal?
The only polygon with no diagonal is the triangle.
How can you make one cut in a hexagon to make a triangle and a pentagon?
You need to draw one diagonal. Look at the hexagon and then look at a pentagon. The triangle should stand out pretty well then.
Can you get a right triangle out of a rectangular prism?
Draw a straight line segment connecting two opposite corners of one of the rectangular faces (a diagonal).
What does a a right isosceles triangle look like?
It is an isosceles triangle with a right angle between the sides of equal length. Also the equal angles are 45o. * * * * * Take a square, draw one of its diagonals. The shape that is on one side of that diagonal is a right isosceles triangle.
