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# Multiples of Pi

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## Mr Mattock

on 1 May 2016

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#### Transcript of Multiples of Pi

Multiples of Pi
Starter
Expand and simplify

(a) (3x - 2)(2x + 1)

(b) (3 5 - 2)(2 5 + 1)

(c) (3 - 2)(2 + 1)
Activity
AQA Higher Tier GCSE Maths Book Page 343

Questions 1 and 6
Examples
Expand and simplify

(a) 5( - 2) - 3(6 - 2 )

(b) (4 +3)(4 - 3)

(c) (5 - 2 )
L.O. - Simplify exact expressions using multiples of pi.
Starter
Expand and simplify

(a) (3x - 2)(2x + 1) =
6x - x - 2

(b) (3 5 - 2)(2 5 + 1) =
6 5 - 5 - 2 (= 28 - 5)

(c) (3 - 2)(2 + 1) =
6 - - 2
2
2
2
2
Examples
Expand and simplify

(a) 5( - 2) - 3(6 - 2 )

(b) (4 +3)(4 - 3)

(c) (5 - 2 )
2
=5 - 10 - 18 + 6 = 11 - 28
=16 - 12 + 12 - 9 = 16 - 9
2
2
=25 - 10 - 10 + 4 = 25 - 20 + 4
2
2
Activity
Calculate the exact perimeter and area of this sector:
8 cm
Activity
Calculate the exact perimeter and area of this sector:
8 cm
Perimeter = 4 + 16 or 4( + 4)

Area = 16
Activities
Activity