coordinate geometry help.....
anyone to help??

Question

coordinate geometry help.....
anyone to help??

anonymous · Answer

http://gyazo.com/bcb5d167d01e99f755620d337fd55974

e.mccormick · Answer

Find the slope from A to B, that tells you B to C.
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anonymous · Answer

i get that part, i am referring to the 2nd question pls....

e.mccormick · Answer

Ah.  Well, the line perpendicular has a slope that is the negative inverse.  So find the slope and use C to put it in point slope form.  Then solve for the y intercept to get the triangle.

anonymous · Answer

i am having problem visualizing the situation......

e.mccormick · Answer

|dw:1365283108661:dw|

anonymous · Answer

oh ok.....thank you...that is just what i needed!

e.mccormick · Answer

Kk.  I would then use the determinant method to solve.
$$
\begin{array}{cc}
A = \left[
\begin{array}{ccc}
x_1 & y_1 & 1 \
x_2 & y_2 & 1 \
x_3 & y_3 & 1 \
\end{array}
\right],&
\mathrm{Area\,}\triangle = \frac{1}{2}det/A/
\end{array}
$$

anonymous · Answer

thank you

e.mccormick · Answer

np.  Have fun!