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Introduction to Polygons

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Introduction to Polygons

Help plan a mini-golf course by identifying, classifying and designing polygons. Remember: a polygon is a closed, flat shape made only from straight line segments.

Polygon pit stop

Check each shape carefully: polygons have straight sides, meet at vertices and enclose a space.

1.Which mini-golf obstacle is a polygon?

A closed triangle made from three straight rails
A circular tunnel
An open zigzag rail
A loop with one curved edge

2.A practice platform has 7 straight sides. What is its polygon name?

3.A putting green is a quadrilateral. How many sides and vertices does any quadrilateral have?

4.True or false: every polygon has the same length sides.

TrueFalse

Design desk

The course team is sorting obstacle outlines before construction.

5.Sort these shape descriptions into polygon and not a polygon: (a) a closed shape with 5 straight sides; (b) a closed shape with one curved side; (c) an open shape made from 6 straight segments; (d) a closed shape with 8 straight sides.

6.Match each polygon name to its number of sides.

Triangle
Pentagon
Hexagon
Octagon

7.A regular polygon has all sides equal and all interior angles equal. Is every rectangle a regular polygon? Explain why or why not.

8.Riley says, “A star outline is always a polygon.” Explain why this claim needs more information. What must be true of the outline for it to be a polygon?

Build a mini-golf hole

Use the drawing space to invent a closed polygon obstacle for the course. Then describe its properties.

9.Draw a polygon with at least 5 sides. Label each vertex and write its name and number of sides. Your drawing must be closed and have only straight edges.