form 1 mathematics
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Form 1 Mathematics. Area of plane shapes Chapter 16. Review Area of a rectangle. Area of a rectangle = l x b E.g. 6 cm. Area of this rectangle = 6cm x 4cm = 24cm 2. 4cm. Review Area of a square. Area of a square = s x s or s 2 E.g. 5 cm. Area of this square = 5cm x 5cm = 25cm 2. - PowerPoint PPT PresentationTRANSCRIPT
Form 1Form 1MathematicsMathematics
Form 1Form 1MathematicsMathematicsArea of plane shapesArea of plane shapes
Chapter 16Chapter 16
ReviewArea of a rectangle
Area of a rectangle = l x b
E.g. 6 cm
4cm
Area of this rectangle = 6cm x 4cm = 24cm2
ReviewArea of a square
Area of a square = s x s or s2
E.g. 5 cm Area of this square =
5cm x 5cm = 25cm2
ReviewArea of composite shapesWe can find the area of a composite
shape by breaking it up into rectangles and squares.
E.g.This shape can be broken into two rectangles.
10
9
4
3
ReviewArea of composite shapesE.g. Can you find the
dimensions of the rectangles?
10
6
3
4
Now can you find the area of each rectangle?
What is the area of the composite shape?
60 cm2
12cm2
+60 cm2
12cm2 = 72cm2
ReviewArea of composite shapesCan you calculate the
area of this shape?
8
5
35
This shape can be broken into two rectangles.
A Big Oneand
A small one
ReviewArea of composite shapesSo, the area is equal to 8
5 40cm2
subtract
3
5
15cm2 =25c
m2
Area of a parallelogram
To obtain the area of a parallelogram you need two lengths.
The length of the base.
base And the perpendicular height.
Perpendicular height
The area of a parallelogram = base x perpendicular height
Area of ParallelogramE.g.
6cm
4cm
Area of parallelogram =
6cm x 4 cm = 24cm2
Area of triangleArea of a triangle =
½ x base x perpendicular heightWhere …
base
Perpendicular height
Area of triangleE.g. Find the area of
the triangle
5cm
8cm
Area of triangle =
½ x 5 x 8 = 20cm2
Home workReview pg 135 Ex 16c #2, #3Pg 137 Ex 16d #1 to 15Pg 139 Ex 16e #1
Conclusion
Thank you for being your usual
wonderful selves!!!