How many
interior triangles
interior triangles
Sum (E) of
Interior Triangles
Interior Triangles
Measure of each Interior Angle
Name the Drawing
100
Triangle
1
100
Triangle
180
100
Dodecagon
150
100
What is the name of this polygon? How do you know?
This is a heptagon. It has seven sides.
200
Quadrilateral
2
200
Rectangle
360
200
11 sides (Hendecagon)
11-2=9
9(180)=1620
1620/11=147.2727
200
What is the name of this polygon? How do you know?
This is a quadrilateral. It has 4 sides.
300
Pentagon
3
300
Nonagon
1260
300
13 sided figure
13-2=11
11(180)=1980
1980/13=152.3076
300
What is the name of this polygon?
This is a regular pentagon.
400
Hexagon.
4
400
Decagon
1440
400
50 sided figure
50-2=48
48(180)=8640
8640/50=172.8
400
Name the quadrilaterals: a, b, and d.
BONUS 200: Name all the quadrilaterals.
(a) rectangle, (b) square, (c) parallelogram; (d) rhombus and (e) kite
500
Nonagon
7
500
n-gon
(n-2)*180
500
102 sided figure
102-2=100
100(180)=18000
18000/102=176.47
500
What are the names of these triangles?
Top: Equilateral triangle, Right-angled triangle, Isosceles triangle
Bottom: Scalene triangle, Acute triangle, Obtuse triangle