Polygons and Circles Flashcards
The formula for area of a circle
3.14 x r x r
The formula for circumference of a circle
6.28 x r
The formula for central angle of a polygon
360 / n
The formula for the exterior angle of a polygon
360 / n
The formula for the sum of the interior angles of a polygon
(n-2) x 180
The formula for one interior angles of a polygon
(n-2) x 180 / n
How many sides does a pentagon have?
5
How many sides does a hexagon have?
6
How many sides does a heptagon have?
7
How many sides does a octagon have?
8
How many sides does a nonagon have?
9
How many sides does a decagon have?
10
If the radius of a circle is 10, what is the diameter?
20
If the diameter of a circle is 16, what is the radius?
8
The formula for area of a triangle?
b x h /2
What is the definition of a “regular” polygon?
All the angles are the same, and all the side lengths are the same
Convex or non-convex?
Convex
Convex or non-convex?
Non-Convex
Convex or non-convex?
Non-Convex
Regular or Irregular polygon?
Regular
Regular or Irregular polygon?
Irregular
Regular or Irregular polygon?
Irregular
What does this formula solve for? 3.14 x r x r
Area of a circle
What does this formula solve for? 6.28 x r
Circumference of a circle
What does this formula solve for? (n-2) x 180
The sum of the interior angles of a polygon
What does this formula solve for? (n-2) x 180 / n
One interior angle of a polygon
What does this formula solve for? 360 / n
The central angle OR one exterior angle of a polygon
Is 5 the radius or diameter?
Radius
Is 18 the radius or diameter?
Diameter
What is the diameter of the circle?
6
What is the radius of the circle?
7
