Identify the congruent triangles in the figure

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

F(x) = x2 − 9, and g(x) = x − 3 f(x) = x2 − 4x + 3, and g(x) = x − 3 f(x) = x2 + 4x − 5, and g(x) = x − 1 f(x) = x2 − 16, and g(x) = x − 4 h(x) = x + 5 arrowright h(x) = x + 3 arrowright h(x) = x + 4 arrowright h(x) = x − 1 arrowright

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?