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The right pentagon (Posted on 2004-06-12) Difficulty: 3 of 5
There is a pentagon ABCDE such that angles A, C, and E are all right angles and it is concave at angle C.

If a ray starting at D was aimed at C, it would go exactly 1 inch before going through C, and would eventually go through A.

If BC and AE are both 5 inches, what is the area of this pentagon?

See The Solution Submitted by Gamer    
Rating: 3.3333 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Hints/Tips Drawing | Comment 5 of 11 |

I have a drawing here for everyone's use, especially my own.

A___________E   <A, <C, and <E are all right angles.
| | A, C, and D are colinear.
| | CD=1, BC=AE=5
| C_ | What is the area?
| / \_ |
| / \_|
| / D
| /
|/
B

Now I hope that turns out right.


  Posted by Tristan on 2004-06-12 12:33:16
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