Edexcel GCSE Biology · 1BI0
Specification 5.19B · Paper 1
Revise: Calculating Cross-Sectional AreasIt is usually easier to measure the diameter straight across the centre, then divide by two to find the radius.
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GCSE Biology · key term
The distance across a circle through its centre; it is twice the radius.
Used by Edexcel and OCR
Specification 5.19B · Paper 1
Revise: Calculating Cross-Sectional AreasIt is usually easier to measure the diameter straight across the centre, then divide by two to find the radius.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Calculating AreasFirst identify whether the question gives a radius or a diameter.
If given a diameter, halve it before substituting into .
Square the radius, not the diameter, and give the answer in square units such as mm².
Check whether the measurement given is a radius or a diameter. If it is a diameter, divide it by 2 before using .
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