Polygons
Give me an example of (3) polygons.
Possible answers:
triangle, square, rhombus, parallelogram, rectangle, pentagon, hexagon, heptagon, octagon, nonagon, decagon
A triangle whose sides are the same or equal length.
(Hint: The word reminds me of the word "equal")
Equilateral triangle
6+1=
7
10-4=
6
5x2=
True or False: If a shape has an opening, it is a polygon.
False! Polygons are closed. There are no openings.
This angle measures between 0 and 90 degrees.
(Hint: Think "cute")
Acute angle
2+14=
16
9-4=
5
9x3=
27
Polygons only have what kinds of lines?
Straight lines (no curves!)
A triangle whose sides are all different lengths.
Scalene triangle
8+3=
11
11-2=
9
4÷2=
2
This word classifies polygonal shapes whose sides and angles are different.
(Hint: Think "not regular")
Irregular polygons
A right angle is an angle that measures how many degrees?
90 degrees
9+X=
X=5
14
4-X=
X=2
2
12÷3=
4
This word classifies polygonal shapes whose sides AND angles are equal.
Regular Polygons
A triangle which has two sides with the same length
(Hint: Think "ice")
Isosceles triangle
17+X=
X=2
19
15-X=
X=5
10
5x11=
55