# Triangle Proof

• November 9th 2008, 05:01 PM
disturbedpanda
Triangle Proof
Could anyone help me with this 3D figure proof?

http://img512.imageshack.us/img512/1851/3dproof1cn2.jpg

I don't care if its a paragraph proof, a flow proof, or a 2 column proof, whatever floats your boat =D

Thanks,
DisturbedPanda
• November 9th 2008, 06:20 PM
dude15129
Could anyone help me with this 3D figure proof?

http://img512.imageshack.us/img512/1851/3dproof1cn2.jpg

You also know that QC is shared by both triangles so that QC =QC.
Therefore, you can conclude side angle side.
• November 9th 2008, 06:39 PM
Soroban
Hello, disturbedpanda!

$\begin{array}{cccc}
1. & CR = CS & & \text{Given} \\
2. & QC \perp CR & & \text{Given} \\
3. & QC \perp CS & & \text{Given} \\
4. & \angle QCR = \angle QCS & & \text{d{e}f. of perp.} \\
5. & QC = QC & & \text{Identity} \\
6.& \Delta QCR \cong \Delta QCS & & \text{s.a.s.}\end{array}$