Free reference guide · QCE
Worked examples: QCE General Mathematics Formula Book
Use the QCAA General Mathematics formula book with worked examples for measurement and recurrence.
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Measurement · trapezium
Formula or reference: A = h(a + b)/2
Units and conditions: a and b are the parallel sides. Use their perpendicular separation h.
Worked example: A canal cross-section with parallel sides 4.5 m and 7.5 m, 2 m apart, has area 12 m².
Growth · arithmetic sequences
Formula or reference: t(n) = t(1) + (n − 1)d
Units and conditions: d is the change each step. n starts at 1.
Worked example: A theatre has 18 seats in the first row and adds two seats per row. Row 9 has 34 seats.
What to work out beyond the sheet
Write the first term and the time of the first observation before choosing an arithmetic or geometric model.
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