Nursing Preparation Study Guide

Nursing Preparation Study Guide

4.3.5 Congruent Circles Two circles are said to be congruent if they have same radius. That is, if we move one of the circles over the other, then they both with coincide. The circle with center O and radius r is congruent to circle with center and radius , if and only if = . Circumference: the perimeter of a circle is known as circumference and is enclosed with a definite length which is calculated by using the formula: Circumference = 2 Where, is a constant and denotes the length of the radius of the circle. Area : The area of the circle can be calculated using the following formula: Area = 8 4.3.6 Types of Angles • Central Angle: an angle whose vertex is located on the center of a circle and whose sides are two radii of the circle interesting on the edge of a circle. o The measure of the central angle is equal to the measure of the intercepted arc. • Inscribed Angle: an angle formed by two chords in a circle which have a common endpoint. This common endpoint forms the vertex of a circle. o The measure of an inscribed angle is equal to half the measure of its inscribed arc.

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