      # Software Development  ## Formulae and Calculating in the Correct Order

Note: The formula for calculating the area of a circle is pi * r * r. However, a close approximation to this is 22/7 * r * r

 Question 1 Choose the correct formula for calculating the lawn area shown in the diagram? L1 * W1 - L2 * W2    L1 * W1 + L2 * W2    L1 + W1 * L2 + W2    L1 * W1 * L2 * W2

 Question 2 Choose the correct formula for calculating the field area shown in the diagram? length * width + pi * r * r    length * width - 21/7 * r * r    length * width + 21/7 * r * r    length * width + 21/7 * d

 Question 3 Ms Lawnsword performed the following calculations on the lawns shown below but kept getting the wrong answer. 1. Lawn1 area = length * width 2. Lawn2 area = 22/7 * r * r 3. Total area = lawn1 area + lawn2 area 4. Number of bags of lawn seed = lawn seed amount / amount in a bag 5. Lawn seed amount = total area * amount that covers 1 square meter Which one of the calculation lines above is she trying to carry out too soon? line 1 line 2 line 3 line 4 line 5

 Question 4 Ms Lawnsword calculated that two different fields need the following amounts of hay meadow seed. Field1 needs 400 grams, Field 2 needs 1600 grams. She wrote down the formulae for calculating the number of bags as follows... 1. Number of bags for Field1 = Field1 amount / amount in a bag 2. Number of bags for Field2 = Field2 amount / amount in a bag 3. Total number of bags of seed = Number of bags for Field1 + Number of bags for Field2 Her son says this is incorrect and she should use the following formulae... 1. Total seed amount = Field1 amount + Field2 amount 2. Number of bags of seed = total seed amount / amount in a bag Who is correct? Ms Lawnsword Ms Lawnsword's son Neither of them is correct Both of them are correct

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