Formulae

Where this fits in the syllabus

Grade 10 · Term 3

Key points to revise

Revise Formulae fast with concise, exam-ready key points

About O/L Mathematics: O/L Mathematics covers number systems, algebra, geometry, trigonometry, and statistics across Grade 10 and 11.

• Area of a circle: A = π r², so r = √(A)/(π)
• Pythagoras: a² + b² = c², so a = √c² - b²
• Simple interest: I = (PRT)/(100)
• For a length/area/time, keep only the positive square root

Must know

• A formula is a balance: do the same to both sides, always
• Change the subject by undoing operations in reverse BODMAS order
• Squared letter → square-root both sides; letter under a root → square both sides (the whole side)
• Keep only the positive root for a length, area, or time

Source: Idasara knowledge pack — english/OL_10/mathematics v17, short_notes: Lesson 22 - Formulae

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In the Syllabus