1. (a) Solve the following equation and give your answer up to two decimal places : x2 − 5x − 10 = 0 (Type in the answers separated by commas. Leave no spaces around the commas.)   2. (b) PQR is a right-angled triangle with PQ = 3 cm and QR = 4 cm. A circle which touches all the sides of the triangle is inscribed in the triangle. Calculate the radius of the circle.   3. (c) In the given figure, write (i) the co-ordinates of A, B and C. (Type in the answers separated by commas. Leave no spaces around the commas.)