7-3 - marquette university high schoolfaculty.muhs.edu/kresovic/mt125/classnotes/7-3 notes p7...
TRANSCRIPT
-
AMDG Name 7: Polygons Ms. Kresovic Adv Geo ‐ 7.3: Formulas involving polygons Date
Yes, you do need to know these names, and how to spell them correctly. Let’s look back at 5.4: 11. Find the sum of the measure of the angles of a polygon.
Polygon
Draw
ing
Num
ber
of side
s = n
Num
ber
of
triangles
that can
be
draw
n from
ONE
vertex.
Sum of
angles
of th
e po
lygon
3
4
5
6
7
8
n
-
AMDG
B
A
C
O
C D
L
-
AMDG Name 7: Polygons Ms. Kresovic Adv Geo ‐ 7.3: Formulas involving polygons Date
-
AMDG
Looking back at our work in 5.4: How many diagonals does a n‐sided polygon have? Po
lygon Draw
ing
Num
ber o
f sides = n
Num
ber o
f diagonals
1st change:
Diffe
rence in
diagon
al cou
nt
2nd change:
Diffe
rence in th
e
diffe
rence
Attempted
form
ulas:
How m
any vertices
does th
e po
lygon
have?
How m
any diagon
als
meet a
t one
vertex
of th
e po
lygon
3 ‐ ‐ ‐ ‐
4 ‐ ‐
5
6
7
8
n
-
AMDG Name 7: Polygons Ms. Kresovic Adv Geo ‐ 7.3: Formulas involving polygons Date
Class Examples
4 Find the sums of the measures of the angles of a… Name Number of sides work Solution A Quadrilateral B Heptagon C Octagon D dodecagon E 93‐ gon