The diagram shows a sketch of the circle with the equation x^2 + y^2 =5 The y-coordinate of point A is -1 The tangent to the circle at A crosses the axes at B and C as shown Find the area of triangle OBC.
The diagram shows a sketch of the circle with the equation x^2 + y^2 =5 The y-coordinate of point A is -1 The tangent to the circle at A crosses the axes at B and C as shown Find the area of triangle OBC.
i worked out the x coordinate of A which would be 2 i did this by substituting and got x= + or - 2 so i chose +2 as its not on the negative side than thats it
i worked out the x coordinate of A which would be 2 i did this by substituting and got x= + or - 2 so i chose +2 as its not on the negative side than thats it
Okay the next thing you have to do is find the equation of the tangent, which is a standard thing you need to know how to do for GCSE. Have you done it before?
i tried that but i haven't got the gradient as i only have one coordinate of the tangent
technically if you know the coordinates of point A then you can find the equation of the tangent. This is because the question does not mention any translation which means that the centre of the circle is (0,0)