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12G Area of a trapezium + area of composite figures

Area of trapeziums and composite figures 
Schedule: 
  • Learning goals
  • Revision 
  • Area of a trapezium 
  • Area of composite figures 
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Slide 1: Diapositive
WiskundeMiddelbare schoolvwoLeerjaar 2

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Area of trapeziums and composite figures 
Schedule: 
  • Learning goals
  • Revision 
  • Area of a trapezium 
  • Area of composite figures 

Slide 1 - Diapositive

Learning goals 
At the end of this lesson I can:
  •  Calculate the area of any trapezium 
  • Calculate the area of a composite figure 

Slide 2 - Diapositive


A
A
B
B
C
C
D
D

Slide 3 - Quiz


A
A
B
B
C
C
D
D

Slide 4 - Quiz

What is a trapezium?

Slide 5 - Question ouverte

Area of a trapezium
A quadrilateral with at least one pair of parallel lines
Area of a trapezium = 
​2​​(a+b)h​​

Slide 6 - Diapositive

Area of a trapezium

Slide 7 - Diapositive

Find the area
Done? Can you answer this: 

Slide 8 - Diapositive

Find the area
Done? Can you answer this: 
A=​2​​(3+7)⋅4​​=
A=​2​​(14+11)⋅10​​=
A=​2​​(12+20)⋅7​​=
20 cm2
125 cm2
112 cm2
Area rectangle = 70·165 = 11550 m2
Area trapezium =                              21175 m2
Total Area = 11550 + 21175 = 32725 m2

Money earned in total = 7 · 32725 = 229 075 pounds
​2​​(165+220)⋅110​​=

Slide 9 - Diapositive

What to do

- I really want a challenge                                                  Open the Pink slides on LessonUP

- I understand it, but I think a                                           Open the Blue slides on LessonUp
 bit more practice will help me                 

- I think more practice will help me,                             Work with the board
and would like to do more board work                                                               

Slide 10 - Diapositive

Area of composite figures 
Basic shapes: square, rectangle, triangle, parallelogram, trapezium
Composite shape: A shape created with 2 or more basic shapes. 

Slide 11 - Diapositive

Extra practice + help
p. 262 : 12G             1abc, 2, 4
ManageBac > Files > Unit 5: Measurement > Area of compound shapes 1 (questions 2-6)
                                  




Slide 12 - Diapositive

Extra practice
p. 262 : 12G             1abc, 3, 4
ManageBac > Files > Unit 5: Measurement > Area of compound shapes 1 (Questions 2-6)
ManageBac > Files > Unit 5: Measurement > 
                                  




Slide 13 - Diapositive

Challenge
p. 262 : 12G             3, 4
ManageBac > Files > Unit 5: Measurement > Area of compound shapes 2
ManageBac > Files > Unit 5: Measurement > Surface area 2
                                  




Slide 14 - Diapositive

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