True: A diameter is twice as long as a radius. , A diameter is the longest chord of the circle, Radius is the distance from the center of the circle to its outer rim., Chord is a line segment whose endpoints are on a circle., The formula of finding the area of a circle is A=ΠXrXr Π , The radius of a circle is r units., False: Circles is an open shape., The value of Pi= 23/7 or 3.18, The formula of finding the perimeter is C = 2ΠrxΠ, Circle is a round 3D figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).,

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