Wednesday

November 26, 2014

November 26, 2014

Posted by **Louisa** on Monday, November 7, 2011 at 11:11am.

- Geometry -
**denise**, Monday, November 7, 2011 at 2:36pmasume 11 and 12 are parallel 5 is 83 what is the measure of 7

- Geometry -
**Steve**, Monday, November 7, 2011 at 6:30pmno sides of a regular pentagon are parallel

5 is not 83

7 is 7

What planet are you calling from?

Divide the pentagon into 5 congruent triangles with base angles of 54°

If s = side length,

the triangles have base = s

then the apothem is h = s/2 tan 54°

The area of the pentagon is 5 * s/2 * s/2 tan 54° = 5s^2*tan54°/4

Note that this is just area = 1/2 * perimeter * apothem

Note: 6.5/4.7 = 1.383 but tan54° = 1.376 so the above dimensions do not fit a regular pentagon.

Ignoring that, however, and using their figures,

a = 5*9.4/2 * 6.5 = 152.75

- Geometry -
**Kiara**, Sunday, February 26, 2012 at 8:06pmErica is playing with some regular pentagon tiles and discovers she can made a five pointed star:Explain how she can use angle measures of the pentagons to fink the angle measure of the point of the star

**Answer this Question**

**Related Questions**

Geomotrey - What is the area of a regular pentagon with a side length of 9.4 ...

Geometry - Hi, I'm having a difficult time understanding a couple of Geometry ...

geometry - Paula built a play area for her dog in the shape of a regular ...

Geometry - If a regular pentagon has sides of four feet, what is the length from...

Geometry - the side of a regular hexagon is twice the square root of its apothem...

4th grade - What is the perimeter of a dog huse in the shape of a regular ...

geometry - Find the area of a regular pentagon with side equal to 3 and apothem ...

geometry - find the area of an equilateral triangle with an apothem having a ...

Geometry - A trapezoid has a perimeter of 14 feet. What will the perimeter be ...

Algebra - A fish pond at the local park is a regular hexagon. a. Write a formula...