Question

Can some1 help me find the apothem and face of a regular dodecahedron? Please por favor

Answer 1

@mathslover

Answer 2

@ganeshie8 plz

Answer 3

are u given the side of polygon ?

Answer 4

or any other info given ?

Answer 5

the edge is 3.3 and the height of Int pyramid is 3.75 (for volume)

Answer 6

hey could u post the snapshot of original quesiton if psble

Answer 7

yea sure, sorry for the delay my mom was calling me to do something and i had no choice

Answer 8

lol okay :) i think we're gona mess wid pentagon

Answer 9

http://en.wikipedia.org/wiki/Dodecahedron

Answer 10

actually now that i knocked some sense into my brain, there is no actual problem lol thats all that i was given and i was able to find the surface area and volume but not the apothem or the face :/

Answer 11

if you have surface area,
just divide 12 to get the area of face ?

Answer 12

so then it would be 18.73599889

Answer 13

18.74

Answer 14

Correct !

Answer 15

did u use some formula for surface area ?

Answer 16

yeah i used SA= 3 sqrt |25+10|sqrt5| a^2

Answer 17

good, now that u have area of face, can u find apothem ?

Answer 18

i really dont understand how to get apothem :(

Answer 19

use below :

Area of face = 1/2 * (perimeter) * (apothem)

Answer 20

since the face is a pentagon, it has 5 edges.

so perimeter = ?

Answer 21

16.5 since each edge is 3.3

Answer 22

yes, plug that

Answer 23

Area of face = 1/2 * (perimeter) * (apothem)


18.74 = 1/2 * 16.5 * (apothem)

Answer 24

you can solve `apothem`

Answer 25

would it be 2.271515152?

Answer 26

\(\large \color{red}{\checkmark}\)

Answer 27

would the volume for this shape be 275.39 ?

Answer 28

http://www.wolframalpha.com/input/?i=1%2F4%2815%2B7sqrt%285%29%29*3.3%5E3

Answer 29

volume = 275.39 is correct

Answer 30

is it possible for you to help me with three more shapes and then i wont bother you anymore :) and thanks

Answer 31

sure, il try :)

Answer 32

yay thanks can you help me find the volume of a triangular prism with the info given:
~Length of rectangle:7
~base of triangle:6.4
~base of angle triangle:63 degrees