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CP = √(PB² + BC²)
CP = √(5² + 5²)
CP = √50
CP = 5√2
dengan menggunakan sgitiga PCQ (siku-siku di C), maka
PQ = √(PC² + CQ²) = √((5√2)² + 5²) = √(50 + 25) = √75 = 5√3
maka, cos(PQ, ABC) = PC / PQ = 5√2 / 5√3 = √2 / √3 = 1/3 √6