Finding area of a triangle using equation of a circle **Ignore notes I made they are stupid
Without a calculator
Question reads:

The diagram shows a sketch of the circle with 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 $OBC$



Some hints:


*

*Using the $y$ coordinate of $A$, find the $x$ coordinate of $A$.

*Find the slope of line $OA$.

*From that, calculate the slope of the tangent line $BC$.

*Using point-slope form, calculate the intercepts.

*Profit!

