GT Geometry
Put CW/HW from
yesterday on the
corner of your desk,
with a pen.
Geom Drill 4/23/16
7X+5
2x-3
5x
Find the
length of the
longer of
the two
parallel
sides.
Drill Cont
What does it mean to
circumscribe an object?
OBJECTIVE
TO STATE AND APPLY
THE FORMULA FOR
THE AREA OF A
REGULAR POLYGON.
Find the area of the regular hexagon using formulas
you already know. Important information: Regular
Hexagon, OA is the ra...
REGULAR POLYGON
Describe perimeter
s7
s5
s3
s2
s1
s6
s4
s8
REGULAR POLYGON
Write a formula for the
area
s7
s5
s3
s2
s1
s6
s4
s8
a
REGULAR POLYGON
All angles congruent
and all sides
congruent.
Vocabulary
Center of a regular
polygon is center of
the circumscribed
circle.
Vocabulary
Radius of a regular
polygon is distance
from the center to a
vertex.
Vocabulary
Central angle of a
regular polygon is the
angle formed by two
radii drawn to
consecutive vertices.
vocabulary
Apothem of a regular
polygon is the shortest
distance from the center
of the polygon to a side.
AREA OF A REGULAR POLYGON
A = 1/2(ap)
a: apothem
p:perimeter of the
polygon
FIND THE AREA:(exact)
Apothem is 9,
figure is regular
FIND THE AREA: (exact)
Radius is 4, figure
is regular
FIND THE AREA:
Side is 4, figure
is regular
CLASSWORK
 Worksheet 5.6
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002 area of regpoly

  1. 1. GT Geometry Put CW/HW from yesterday on the corner of your desk, with a pen.
  2. 2. Geom Drill 4/23/16 7X+5 2x-3 5x Find the length of the longer of the two parallel sides.
  3. 3. Drill Cont What does it mean to circumscribe an object?
  4. 4. OBJECTIVE TO STATE AND APPLY THE FORMULA FOR THE AREA OF A REGULAR POLYGON.
  5. 5. Find the area of the regular hexagon using formulas you already know. Important information: Regular Hexagon, OA is the radius of the circumscribed circle EF DE CD BC AB FA
  6. 6. REGULAR POLYGON Describe perimeter s7 s5 s3 s2 s1 s6 s4 s8
  7. 7. REGULAR POLYGON Write a formula for the area s7 s5 s3 s2 s1 s6 s4 s8 a
  8. 8. REGULAR POLYGON All angles congruent and all sides congruent.
  9. 9. Vocabulary Center of a regular polygon is center of the circumscribed circle.
  10. 10. Vocabulary Radius of a regular polygon is distance from the center to a vertex.
  11. 11. Vocabulary Central angle of a regular polygon is the angle formed by two radii drawn to consecutive vertices.
  12. 12. vocabulary Apothem of a regular polygon is the shortest distance from the center of the polygon to a side.
  13. 13. AREA OF A REGULAR POLYGON A = 1/2(ap) a: apothem p:perimeter of the polygon
  14. 14. FIND THE AREA:(exact) Apothem is 9, figure is regular
  15. 15. FIND THE AREA: (exact) Radius is 4, figure is regular
  16. 16. FIND THE AREA: Side is 4, figure is regular
  17. 17. CLASSWORK  Worksheet 5.6

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