2.24 Thursday Composite Figures

2.24 Thursday Composite Figures

By Sakina George

​Video is in Google Classroom

​Video is in Google Classroom

​Video is in Google Classroom

​LET's Begin!

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Multiple Select

Which shapes did you choose?

• rectangle

• trapezoid

• circle

• triangle

Multiple Select

Which formulas will you use?

• A = b * h

• A = $$\pi r^2$$   

• A= $$\frac{1}{2\ }\cdot b\cdot h$$  

• A = $$\frac{1}{2\ }\cdot\left(b_1+b_2\right)\cdot h$$  

Draw

Split the figure into 2 shapes

Multiple Select

Let's start with the rectangle.

EASY PEASY :)

Which two numbers would you use? A = b * h

• 12

• 8

• 4

Multiple Choice

A = b * h

What is the area of the rectangle?

• 72

• 32

• 36

Multiple Choice

A = $$\frac{1}{2}$$  b * h

Time for the TRIANGLE!

What is the b (base) of the triangle?

• 12

• 8

• 4

Multiple Choice

A = $$\frac{1}{2}$$  b * h

What is the h (height) of the triangle?

• 12

• 8

• 12 - 8 = 4

Why?

12 is the height of both figures put together.

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To find the height of the triangle, you take the total height and subtract the rectangle height.​

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Total height 12 - rectangle height 8 = 4 triangle height​

Multiple Choice

A = $$\frac{1}{2}$$  b * h

What is the area?

A = $$\frac{1}{2}$$  * 4 * 4

• 8

• 16

• 32

Multiple Choice

Once you find the area of the rectangle and the area of the triangle, ADD them together to get the total area of the composite figure.

• A = 32 + 8 = 40

• A = 36 + 4 = 40

• A = 36+ 8 = 44

• A = 32 + 16 = 48

Poll

Which is the BEST?

• SAMSUNG

• iPhone

Draw

The figure is split up for you.

1. Write the base of the triangle on the screen.

2. Write the radius of the circle on the screen.

Multiple Choice

What numbers will you use for the triangle?

• 4

• 6

• 10

• 2

Why is the answer 4?

Total base of the figure is 10

Base of the rectangle is 6

10 - 6 = 4

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and the height of the figure is 4. (look at the circle)​

Multiple Choice

A = $$\frac{1}{2}$$   b * h

What is the area of the triangle?

• 4

• 16

• 8

• 2

Multiple Select

What numbers will you use for the rectangle?

• 4

• 6

• 10

• 2

Multiple Choice

A = b * h

What is the area of the rectangle?

• 8

• 60

• 40

• 24

Multiple Choice

A = $$\pi\cdot r^2$$  

Which number represents r?

• 10

• 6

• 4

• 2

Multiple Choice

A = $$\pi\cdot r^2$$  

What is the area a FULL circle?

• 50.24

• 12.56

• 25.12

Multiple Choice

A = $$\pi\cdot r^2$$  

What is the area a $$\frac{full\ circle}{2}$$  ?

• 3.14

• 12.56

• 6.28

Multiple Choice

Area of the triangle = 

Area of the rectangle =

Area of the semi circle (half the circle) =

What is the total area of the composite figure? (add all of the areas...go back if you need to)

• 38.28 $$cm^2$$  

• 12.56 $$cm^2$$  

• 6.28 $$cm^2$$  

​- LAFO Lions

" Only Excellence Will Do. " 

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Awesome Job!

Pat yourself on the back​