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# CBSE Class 11-science Answered

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.

Asked by kandappan | 08 Feb, 2020, 11:29: AM Expert Answer
1.
Equation of circle in the standard form is (x-h)2 + (y-k)2 = r2
Given equation of circle is x2 + y2 = 16 Answered by Renu Varma | 10 Feb, 2020, 11:24: AM

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