To rotate the polygon about point P, we will rotate each vertex of the polygon about point P. Let's begin with vertex B. We will first draw a segment from B to P.
Next, we will draw a 45∘ angle using PB. Since the direction of the rotation isn't stated, we will assume that it is counterclockwise.
Now, we will use a ruler to draw B′ such that PB=PB′.
By repeating the process for vertices C and A, we can draw △A′B′C′.
Finally, we will remove the unnecessary elements to see △A′B′C′.