Diagram NOT accurately drawn
The diagram shows a triangular piece of card with a rectangular window cut out. The triangle has a base of 18 cm and a perpendicular height of 12 cm. The rectangular window measures 9 cm by 3 cm.

Work out the area of the card that remains.
35 exam-style questions on AQA GCSE Maths Area of Compound Shapes. Each one has a worked solution and a mark scheme showing where the marks go.