(a) Match the following figures with their respective areas in the box.
1.
Area of above shape $=\left(\pi \times 7^2\right) \div 2=77 \mathrm{~cm}^2$
2.
Area of above shape $=14 \times 7=98 \mathrm{~cm}^2$
3.
Area of above shape $=7 \times 7=49 \mathrm{~cm}^2$
4.
Area of above triangle $=\frac{1}{2} \times 14 \times 7=49 \mathrm{~cm}^2$
5.
Area of above shape $=b \times h =14 \times 7=98 \mathrm{~cm}^2$