perimeter and area of a shape
DESCRIPTION
Perimeter and area of a shape. By Yejin and Amy. Square. 10cm. To find out the area and perimeter of a square you have to do…. P=40cm A=100cm. Area: Length x Width Perimeter: Length + Width + Length + Width. Eg. P=10+10+10+10=40cm A=10x10=100cm - PowerPoint PPT PresentationTRANSCRIPT
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Perimeter and area of a shape
By Yejin and Amy
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P=40cm
A=100cm
To find out the area and perimeter of a square you have to do….
10cm
Area: Length x Width
Perimeter: Length + Width + Length + Width
Eg. P=10+10+10+10=40cm A=10x10=100cm
We did 100cm because we times cm by itself, which makes cm
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12cm
To find out how to calculate the area and perimeter of a rectangle you have to do…..P=40cm
A=96cm8cm
Area: Length x Width
Perimeter: Length + Width + Length + Width
Eg. 8+12+8+12=40cm A=8x12=96cm
We did 96cm because we times cm by itself, which makes cm
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To find out how to calculate the area and perimeter of an isosceles triangle you have to do…..
10cm
10cmArea: height x breadth divide by 2
Why?
Because there are 2 right angled triangles and each has an area of 25cm
Eg. P= 10+11+11= 32cm A=10x10 divide by 2=50cm
We did 50cm because we times cm by itself, which makes cm
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A square number is a number that times it by it self , for example….
8 =8 x8 9 = 9 x 9 10 = 10 x 10 11 = 11 x 11
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Pythagoras Theorem
Pythagoras was a famous mathematician. It is called Theorem because it is not 100 percent proved to be right.
To see how to do it click…
Example
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Pythagoras Theorem
16cm 4cm
3cm 9cm
25cm
5 cm
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Circumference of a circle and area of a circle
To get perimeter (called circumference) of a circle you have to do..
D x pi = Circumference of a circle Pi= 3.142To get area of a circle you have to do….R x pi= area of a circle.R= radiusD= diameter
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Circumference of a circle and area of a circle
Circumference of a circle= Dxpi
Area of a circle= r x pi
diameter
radius
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WRONG!!!!
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Quiz!!!!
What do you have to do to get area?
A: Length x width
B:Width x Width
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CORRECT!!!!
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Quiz
What are the three first numbers of pi?
A: 3.14
B: 3.24
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WRONG!!!
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CORRECT!!
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Quiz!!
What do you have to do to get the circumference of a circle?
A: Dxpi
B: R xpi
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Correct!!
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Wrong!!
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Last quiz
What do you call the area outside a circle?
A: are of a circle
B: don’t know
C: circumference
D: perimeter of a circle
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Correct!!
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Wrong!!
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Half Right Half Wrong!!
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Thank you!!!And WELL DONE!!!