Area, SM-Bank 075 A square fridge magnet has an area of 900 square millimetres. What is the area of the fridge magnet in square centimetres? (2 marks) --- 3 WORK AREA LINES (style=lined) --- Show Answers Only \(9\ \text{cm}^2\) Show Worked Solution \(\text{Strategy 1 (convert square millimetres):}\) \(\text{1 cm}^{2}\ = 10\ \text{mm}\ \times 10\ \text{mm}\ = 100\ \text{mm}^{2} \) \(\text{Side length}\ =\sqrt{900}\ = 30\ \text{mm}\) \(\text{Area} =30^2 =900\ \text{mm}^2 = \dfrac{900}{100} = 9\ \text{cm}^2 \) \(\text{Strategy 2 (convert side lengths):}\) \(\text{Side length}\ =\sqrt{900}\ =30\ \text{mm}= \dfrac{30}{10} = 3\ \text{cm}\) \(\text{Area} =3^2 =9\ \text{cm}^2\)