#geometry transformations please help!!

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mighty turtleBOT
vivid turtleBOT
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floweries.

languid halo
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Since we already have right triangle BCA, we also know that CB^2+CA^2 = BA^2. Note that BA = BQ+QP+PA, so BA^2 also equals (BQ+QP+PA)^2 = BQ^2+2(BQ)(QP)+2(BQ)(PA)+QP^2+2(QP)(PA)+PA^2. (this is a writing problem)

What should I do next? How else can I approach this problem?