Question 17Parallelogram $ABCD$ has area $40 \,\mathrm{cm}^{2}$. $E , F$ are midpoints of $AD , DC$. Find area $\left(AEFC\right)$. $10 \,\mathrm{cm}^{2}$$12 \,\mathrm{cm}^{2}$$15 \,\mathrm{cm}^{2}$$16 \,\mathrm{cm}^{2}$$18 \,\mathrm{cm}^{2}$