# 12 E + 12 F Area of a triangle and parallelogram

Area of Triangle and Parallelogram
Schedule:
• Learning goals
• Revision
• Area of a triangle
• Area of a parallelogram
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Slide 1: Slide
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This lesson contains 18 slides, with interactive quizzes and text slides.

Lesson duration is: 60 min

## Items in this lesson

Area of Triangle and Parallelogram
Schedule:
• Learning goals
• Revision
• Area of a triangle
• Area of a parallelogram

#### Slide 1 -Slide

Learning goals
At the end of this lesson I can:
•  Calculate the area of rectangles
• Calculate the are of triangles
• Calculate the area of parallelogram

#### Slide 2 -Slide

Area of a rectangle
What is the formula for the area of a rectangle ?
What kinds of units do we use for area

#### Slide 3 -Slide

Area of a rectangle
Area of a rectangle = Length · Width

You express area in squares... cm2  m2  ft2

#### Slide 4 -Slide

What is the formula for the area of a triangle?

#### Slide 5 -Open question

Area of a triangle
Area of a triangle =
The Base is often the bottom of the shape
The Height is Perpendicular to the Base

21baseheight

#### Slide 6 -Slide

What is a parallelogram?

#### Slide 7 -Open question

Area of a parallelogram
Area of a parallelogram =
How can you find the height in a parallelogram?
BaseHeight

#### Slide 8 -Slide

Area of a parallelogram
Area of a parallelogram =
How can you find the height in a parallelogram?
Which other area formula is this very similar to?
BaseHeight

#### Slide 9 -Slide

Area of a parallelogram
Area of a parallelogram =

Area of a rectangle =
BaseHeight
lengthwidth

#### Slide 10 -Slide

Practice
Find the area's of the following polygons
A
B
C

#### Slide 11 -Slide

Practice
Find the area's of the following polygons
A = 20m2
B = 10
C = 2 + 6 = 8

#### Slide 12 -Slide

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 13 -Slide

Extra practice + help
p. 259 : 12E             1abcgh, 3
P. 260: 12F               1abcf, 2

#### Slide 14 -Slide

Extra practice
p. 259 : 12E             1defgh, 2, 3
P. 260: 12F               1def, 2, 3, 4

#### Slide 15 -Slide

Challenge
p. 259 : 12E             1ghi, 2, 4
P. 260: 12F               1def, 2, 3, 4

ManageBac > Files > Unit 5 Measurements > Surface area 1
ManageBac > Files > Unit 5 Measurements > Surface area 2
ManageBac > Files > Unit 5 Measurements > Area and surface area composite figures (don't do the last question)

#### Slide 16 -Slide

Homework
P. 257        12D: 7
P. 260       12E: 2
P. 261        12F: 4

#### Slide 17 -Slide

Area and perimeter in the classroom
Go and find different objects in the classroom to measure.

Calculate the area and perimeter of at least 3 different objects and record this information in your notebook.