Units reveal the quantity
Length uses units, area uses square units and volume uses cubic units. Write the correct unit at every step.
CSEC Math LabLearn · practise · master
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14 min
Section 4Measurement
Turn dimensions into useful quantities
Quantify geometrical objects and use measurements to solve practical problems.
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Learn the idea
Three things to notice
A formula is a model
Sketch and label the shape, then choose the formula whose dimensions match the information given.
Scale compares like lengths
A scale of 1:50 means one unit on the drawing represents 50 of the same unit in reality.
Do not memorise the words alone. The worked example shows how to choose and apply the idea.
Syllabus coverage
SI unitsPerimeter and arc lengthArea and sectorsSurface areaVolumeScale and error