In the 17^th question, how can we say that the line joining AI extended to meet BC at D is an altitude of triangle ?
17) In the given figure, ABC is a right angled triangle, right - angled at A . Find the area of shaded region if AB = 6 cm, BC = 10 cm and I is the centre of in- circle of $△$ ABC.

Find the area of shaded region (Take $\mathrm{\pi }$ = 3.14) .