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Gra
Briar
01-04 2
щожи
Xu
mit
19
Triangle is a polygon with three sides
and three interior angles.
This is an interior
A polygon is named using its vertices. The vertices are points A, B, and C.
So, the triangle may be called
triangle ABC, triangle BCA, or triangle ACB
.
Sides of
triangle ABC are AB BC, AC
Interior angles of triangle ABC are 2BAC, ZBCA, and ZABC
3. Lesson Activity
Complete the table.
Name of
Polygon
Number
of sides
Number of
interior angles
Name the
sides
Name the interior
angles
Triangle
3
3
Quadrilateral
4
4
Pentagon
5
5
Hexagon
6
6
Heptagon
7
7
Octagon
8
8
Nonagon
9
9
Decagon
10
10