Triangle Proof

**disturbedpanda** · November 9th 2008, 05:01 PM

Could anyone help me with this 3D figure proof?

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

Thanks,
DisturbedPanda

**dude15129** · November 9th 2008, 06:20 PM

Could anyone help me with this 3D figure proof?

You also know that QC is shared by both triangles so that QC =QC.
Therefore, you can conclude side angle side.

**Soroban** · November 9th 2008, 06:39 PM

Hello, disturbedpanda!

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

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