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Form 1 Mathematics

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.

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Form 1 Mathematics

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  1. Form 1Mathematics Area of plane shapes Chapter 16

  2. ReviewArea of a rectangle Area of a rectangle = l x b E.g. 6 cm Area of this rectangle = 6cm x 4cm = 24cm2 4cm

  3. 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

  4. ReviewArea of composite shapes We can find the area of a composite shape by breaking it up into rectangles and squares. E.g. 10 This shape can be broken into two rectangles. 9 3 4

  5. ReviewArea of composite shapes 10 E.g. 6 Can you find the dimensions of the rectangles? 60 cm2 Now can you find the area of each rectangle? 3 12cm2 What is the area of the composite shape? 4 60 cm2 12cm2 = 72cm2 +

  6. ReviewArea of composite shapes 8 Can you calculate the area of this shape? 5 5 3 This shape can be broken into two rectangles. A small one and A Big One

  7. ReviewArea of composite shapes So, the area is equal to 8 40cm2 5 subtract 5 15cm2 3 =25cm2

  8. Area of a parallelogram To obtain the area of a parallelogram you need two lengths. Perpendicular height The length of the base. base And the perpendicular height. The area of a parallelogram = base x perpendicular height

  9. Area of Parallelogram E.g. 4cm Area of parallelogram = 6cm x 4 cm = 24cm2 6cm

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

  11. Area of triangle E.g. Find the area of the triangle Area of triangle = ½ x 5 x 8 = 20cm2 8cm 5cm

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

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

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