Slide 2 Polygon : is a closed plane figure formed by three or
more segments called sides. Vertex : is the point at which two
sides of a polygon meet. Slide 3 The figure below is not a polygon,
since it is not a closed figure: Slide 4 The figure below is not a
polygon, since it is not made of line segments: Slide 5 The figure
below is not a polygon, since its sides do not intersect in exactly
two places each: Slide 6 There are two types of polygons: REGULAR
AND IRREGULAR examples of regular polygons examples of irregular
polygons Slide 7 Slide 8 The sum of the angles of a triangle is 180
degrees. TRIANGLES Equilateral Triangle An equilateral triangle has
three sides of equal length. This means that each angle is 60
degrees Slide 9 Slide 10 A scalene triangle has three sides with
different lengths. Therefore, it has three different angles. Slide
11 Acute Triangle : An acute triangle has three acute angles. Slide
12 Obtuse Triangle An obtuse triangle has an obtuse angle, in which
one of the angles is more than 90 degrees. Slide 13 Right Triangle
A right triangle has a right angle, in which one of the angles is
90 degrees. A right triangle has a right angle, in which one of the
angles is 90 degrees. Slide 14 A quadrilateral is a four-sided
polygon in which the sum of all the angles is 360 Slide 15 Slide 16
Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 What type of polygon
is on the sides of these pyramids? Slide 22 What type of polygon is
in these beehives? Slide 23 What type of polygon do you see in this
photo? Slide 24
