Level 87 Level 89
Level 88

Areas of Regular Polygons & Circles


31 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Ignore?
Apothem
The perpendicular distance from the center to a side of a regular polygon.
A = 1/2 Pa
formula for area of a regular polygon
A=πr²
Area formula with radius
center of regular polygon
The point of intersection of the perpendicular bisectors of the sides
Inscribed Circle
Inside circle
radius
From center to a point on the circle.
Circumscribed Circle
Outside circle
Central Angle
an angle whose vertex is the center of the circle
Isosceles
two sides have the same length
Yes
In each regular polygon, will the triangles be congruent?
It's the Same
How does the number of triangles formed in each polygon compare with the number of sides?
altitude
What is the apothem called In a triangle?
A= s • a /2
Area of isosceles triangle in terms of a and s
Area of the hexagon
A= 6 • s • a/2
Area of any n-gon-
A= n • s • a/2
perimeter
N•S
360/n
How to find the measure of the central angle in a regular polygon-
Aera
Apothem • perimeter /2
Trigonometry to find the missing segment lengths
When you find the area of regular polygons other than equilateral triangle, squares and hexagons you will need to use..
1/2 (bh)
Area of a triangle
bh
Area of a Parallelogram
s ^ 2
Area of a square
(DD)/2
Area of a rhombus
Area of a trapezoid
1/2 (b+b)h or mh
1/2 (ap)
Area of a regular polygon
Area of a Circle
pi r ^ 2
Circumference
2πr
sin
opp/hyp
cos
adj/hyp
tan
opp/adj
(b+b)/2
Median of a trapezoid