Pentagon

Within a regular pentagon ABCDE point, P is such that the triangle is equilateral ABP. How big is the angle BCP?
Make a sketch.

Correct answer:

x =  66 °

Step-by-step explanation:

φ=360/5=72   α=2180φ=218072=54   x=2180(2 α60)=2180(2 5460)=66



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