Important question of Math for Class 10 Board Exam

 

13 September 2020 

1.  If x= 4CosA + 5 Sin A and Y= 4sinA -5CosA then find the Value of x² + y²

2. In Fig a circle of radius 7.5 cm is inscribed in a square. Find the area of the shaded region (Use π = 3.14)

                                               

Solution- 

3. In the equations shown below, a and b are unknown constants. 

      3ax + 4y = −2 

       2x+ by = 14 

If (–3, 4) is the solution of the given equations, what are the values of a and b? 

4.  The sum of n terms of an AP is 8558. If the 15 term is 97 and the 10th term is 32. What is the nth term?