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# 11.3 to 11.6

### 11.3 to 11.6 Notecards

TermDefinition
Areas of Similar Polygons Theorem if two polygons are similar with the lengths of corresponding sides in the ratio of a:b then the ratio of their areas is a^2: a^b
Circumference the distance around the circle.
Circumference of a Circle Theorem the circumference C of a circle is C= πd or C= 2πr, where d is the diameter of the circle and r is the radius of the circle
Arc Length a portion of the circumference of a circle
Arc Length Corollary in a circle, the ratio of the length of a given arc to the circumference is equal to the ratio of the measure of the arc to 360 degrees
Area of a Circle Theorem the area of a circle is π times the square of the radius. A= πr^2
Sector of a Circle the region bounded by two radii of the circle and their intercepted arc.
Area of Sector Theorem the ratio of the area of a sector of a circle to the area of the whole circle (πr^2) is equal to the ratio of the measure of the intercepted arc to 360 degrees
Center of a polygon the center of an circumscribed circle