Identify if (x^2)+(y^2)=16 is that of a line, a circle, an ellipse, a parabola, or a hyperbola.

What percent of the circle below is shaded?

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree