What is the equation of a circle with center at the origin and a radius of 15 units?, x^2-y^2=225, x^2+y^2=225, x^2+(〖y-1)〗^2=225, x^2+(〖y+1)〗^2=225, Having the same intercepted arc, which is true about the measure of the central angle?, The central angle is one-half the measure of the inscribed angle, The central angle is twice the measure of the inscribed angle, The central angle is equal to the measure of the inscribed angle, None of the above, Which of the following describes the characteristic of a tangent line?, Line that intersects the circle at three points, Line that intersects a circle at only one point., Intersecting line segment joining the center of the two circle., Line that passes through the center to any point of the circle., Which of the following is true about two secant segments drawn to a circle from an exterior point?, If two secant segments are drawn to a circle from an exterior point, then the product of the , If two secant segments are drawn to a circle from an exterior point, then the sum of the , If two secant segments are drawn to a circle from an exterior point, then the difference of , If two secant segments are drawn to a circle from an exterior point, then the quotient of the lengths of one secant segment and its external secant segment is equal to the product of the lengths of the other secant segment and its external segment.  , If an inscribed angle of a circle intercepts a semicircle, then the angle is____., Acute, Obtuse, Straight, Right.

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