Question 4In the diagram, the unshaded area is made of 4 semicircles touching at the centre of the large circle. If the diameter of the large circle is 28 cm, find the area of the shaded region. Use $\pi=\frac{22}{7}$. $616\text{ cm}^2$$462\text{ cm}^2$$308\text{ cm}^2$$154\text{ cm}^2$None of the above
