We are learning to:

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PLT Skills
LESSON OBJECTIVES

• We are learning to
• Finding connections between different words.
• (Which PLT skills?)
• Accurately find missing angles in polygons.
• (Grades D-C)

Always aim high!
AUTHOR
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BRAIN IN GEAR
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EXAMPLE DITDIONA can be rearranged to make
ADDITION
TASK
Work out the following Mathematical anagrams
LONYGOP
SEEDG
TSERVICE
Polygon
Edges
Vertices
EXTENSION
Develop your own Mathematical anagrams as above
as a creative thinker.
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STARTER
PLT Skills
TASK
1)
2)
3)
4)
 
30
50
20
 
 
 
 
 
 
45
 
 
 
Find the value of each angle
 
 
 
 
 
180
-
20
160
-
-
-
-
30
180
50
45
180
90
 
 
60
 
 
 
 
85
60
 
 
 
 
80
EXTENSION
Work out the following without a calculator
180 x 3
1)
2)
3)
4)
180 x 6
180 x 8
180 x 5
540
1440
900
1080
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ANGLES IN POLYGONS
INTRODUCTION
POLYGONS
NON-POLYGONS
QUESTION
WHAT IS A POLYGON?
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ANGLES IN POLYGONS
INTRODUCTION
7 x 180
6 x 180
5 x 180
10 x 180
9 x 180
8 x 180
What is the connection?
x
(number of sides 2)
180
Sum of interior angles
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ANGLES IN POLYGONS
EXAMPLES
1)
2)
 
 
Sum of interior angles
( 5 2 )
x
Sum of interior angles
( 6 2 )
x
180
180
Sum of interior angles
x
Sum of interior angles
x
3
180
4
180
Sum of interior angles
Sum of interior angles
540
720
-
-
-
-
-
-
-
-
-
 
 
90
155
120
110
120
95
80
95
105
 
 
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ANGLES IN POLYGONS
TASK (GRADE D)
3)
4)
1)
2)
110
245
100
60
5)
7)
8)
6)
275
30
85
145
9)
10)
12)
11)
135
280
50
85
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ANGLES IN POLYGONS
EXTENSION (GRADE C)
Which regular polygons have a) a total sum of
2340 b) a total sum of 5400 c) a total sum of
17820 d) interior angles of 156 e) interior
angles of 150 f) interior angles of 170
101 sides
32 sides
15 sides
15 sides
12 sides
36 sides
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ANGLES IN POLYGONS
MINI-PLENARY
Why is this building famous in America? What is
the value of each interior angle?
PENTAGON
( 5 2 )
x
Sum of interior angles
180
United States Defence Headquarters
Sum of interior angles
x
3
180
Sum of interior angles
540
Each interior angle
Each interior angle
108
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DISCOVERY
PLT Skills
11
PLENARY ACTIVITY
EXAM QUESTION (GRADE C)
Sum of interior (n 2) 180
(5 2) 180
3 180 540
2x 3x 5 3x 75 140 540 8x 220
540 8x 320 x 40
Calculate the value of x
12
What have you learnt?
Draw your brain
In your brain, write or draw everything you can
remember about finding missing angles in
polygons. It can be a skill or a reflection, or
something else that might be prominent in your
brain.
13
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SELF ASSESSMENT
Enterprise Skills
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Plenary Activity
How well do you understand the task?
.
I dont understand
I nearly understand
I fully understand
14
Creative Entrepreneur
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SELF ASSESSMENT
Enterprise Skills
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Plenary Activity
WWW (What Went Well) EBI (Even Better If)
On your post it notes Think about how you can
improve your work.