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Grade 7 - Mathematics
7.3 Polygons and Triangles
Points to Remember:
A simple closed figure bound by line segments is called a
The line segments by which a polygon is bound are called its
The sides of the polygon do not cross each other
Exactly two sides meet at every vertex.
Circle is not a polygon as this closed figure is not bounded by line segments.
A polygon with three sides is called a
A triangle is named by its
If D, E, and F are the vertices of a triangle, it is called
The symbol for a triangle is
and is read as "Triangle". "
DEF" is read as "Triangle DEF".
Select if the following statements are true or false. Draw at least 5 examples of your own for polygons and name their properties.
: All triangles are polygons, but all polygons are not triangles.
: A triangle is a simple closed figure.
: A triangle divides a plane in which it lies into three sets of points.
: If A, B, and C are three points, then the union of AB, BC and CA is triangle ABC.
ABC, the points A, B and C are the vertices of the triangle .
: If a point does not lie in the interior of a triangle or on the triangle, then it lies on the exterior of the triangle.
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