CBSE Class 11 science: Circles Videos | Concepts on Circles in Conic sections

• 2 one
  
• find the coordinates of the centre of a circle passing through the points(0,0),(-2,1)and(-3,2).also , find its radius .
  
• Examine whether the point (4, 5) lies outside or inside the circle of equation x^2+y^2-2x-3=0
• SIR PLEASE HELP ME WITH THIS QUESTIONS : 1. Find the equation of the tangent to the circle x^2+y^2=16 drawn from the point (1,4). 2. How many triangles can be formed by joining any 3 of the 9 points when i) no 3 of them  are collinear? ii) 5 of them are collinear? 3. AB is a line of fixed length, 6 units, joining the points A(t,0) and B which lies on thepositive y axis. P is a point on AB distant 2 units from A. Express the coordinates of B and P in terms of t. Find the locus of P as t varies. 4. In a triangle ABC, (b^2 - c^2) / (b^2 + c^2) = sin(B - C) / sin(B + C), prove that it is either a right-angled or isoceles triangle.
• 6
  
• The locus of point for which sum of the squares of distances from cordinate axes is 25 is
• A stadium is in circular shape. Within the stadium some areas have been allotted for a hockey court and a javelin range, as given in the figure. Assume the shape of the hockey court and the javelin range to be square and triangle, resp. The curators would like to accommodate a few more sports in the stadium. Help them by measuring the unallocated region within the stadium.(the radius of the stadium is 200 mts.)  
• Find the equation of the circle with centre (-2,3) and radius 4.
• Find the centre and radius of the circle given by the equation (x + 5)² + (y + 1 )² = 9
• Find the co-ordinates of the centre and the radius of the circle given by the equation x² + y² + 6x - 8y - 24 = 0.

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