Yes. D = 2R
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it would be the diameter of the smaller circle times sqrt 2
That means that a given circle doesn't have two or three diameters. For a given circle, there is a unique measurement, called its "diameter". It is the distance from one end to the other, passing through the center. Since the circle is defined as all the points that are at the same distance from a point (the center), all radii are the same distance; and the diameter is simply twice the radius.
The diameter is a straight line from one side os the circle, through the centre point, to the opposite side of the circle. The radius is a straight line from one side of the circle to the centre point only. So Two radii add to make one diameter. Hence algebrauically, d = 2r If d = 0.75 Then r = 0.75/ 2 r = 0.375
A chord is a straight line from one point on a circle's circumference to another. Because the largest straight line distance in a circle is the diameter and the diameter is also a chord, the diameter is the longest chord. Join the endpoints of a given chord to the center of the circle to form an isosceles triangle. The triangle inequality then tells that the length of the chord is less than two radii of the circle, i.e., less than the diameter. See related links.
The area bounded by an arc of circle and two radii is known as a "circular sector"