Chapter 21: Review

Return to the chapter problem

The chord could fit in the window. Its diameter is $2(7)=14$ cm, and a chord cannot be longer than the diameter. Since $13<14$, this chord is possible.

Mixed practice

Work without notes first. For each question, state which method applies and why.

1. A circle has radius $6.5$ cm. Work out its diameter.

2. An isosceles triangle has equal angles of $52^\circ$. Find the third angle. Explain why you use the triangle angle sum rather than a circle theorem.

What can you now do?

Write one circle fact you can use confidently. Write one fact you want to practise again, and name a question that would help.