AlgebraStudy Notes

Worked Example 2: With a Square

Part of Rearranging Formulae — GCSE Mathematics

This study notes covers Worked Example 2: With a Square within Rearranging Formulae for GCSE Mathematics. Revise Rearranging Formulae in Algebra for GCSE Mathematics with 14 exam-style questions and 11 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 4 of 5 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 4 of 5

Practice

14 questions

Recall

11 flashcards

Worked Example 2: With a Square

Make r the subject of: A = πr²

Step 1 Divide both sides by π

A/π = r²

Step 2 Square root both sides

r = √(A/π)

Keep building this topic

Read this section alongside the surrounding pages in Rearranging Formulae. That gives you the full topic sequence instead of a single isolated revision point.

Worked Example 1: Linear Worked Example 3: Subject Appears Twice (Higher)Making a Letter the Star The Method: Reverse BIDMAS

Practice Questions for Rearranging Formulae

Make b the subject of the formula: a = b + c

A. b = a + c
B. b = c − a
C. b = a − c
D. b = ac

1 markfoundation

The circumference of a circle is given by the formula: C = 2πr Make r the subject of the formula.

2 marksfoundation

Quick Recall Flashcards

What does 'rearranging a formula' produce?

An equivalent formula expressing a different variable as the subject. E.g. v = u + at rearranges to a = (v − u)/t.

What is the 'subject' of a formula?

The variable that stands alone on one side of the equals sign. In v = u + at, v is the subject.

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Worked Example 1: Linear

Worked Example 3: Subject Appears Twice (Higher)