Form 1 Mathematics Area of plane shapes Chapter 16.

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Presentation transcript:

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 4cm Area of this rectangle = 6cm x 4cm = 24cm 2

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

Review Area of composite shapes We 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

Review Area of composite shapes E.g. Can you find the dimensions of the rectangles? Now can you find the area of each rectangle? What is the area of the composite shape? 60 cm 2 12cm cm 2 12cm 2 = 72cm 2

Review Area of composite shapes Can you calculate the area of this shape? This shape can be broken into two rectangles. A Big One and A small one

Review Area of composite shapes So, the area is equal to cm 2 subtract cm 2 =25cm 2

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 Parallelogram E.g. 6cm 4cm Area of parallelogram = 6cm x 4 cm = 24cm 2

Area of triangle Area of a triangle = ½ x base x perpendicular height Where … base Perpendicular height

Area of triangle E.g. Find the area of the triangle 5cm 8cm Area of triangle = ½ x 5 x 8 = 20cm 2

Home work  Review pg 135 Ex 16c #2, #3  Pg 137 Ex 16d #1 to 15  Pg 139 Ex 16e #1

Conclusion Thank you for being your usual wonderful selves!!!