perplexus.info :: Shapes : The right pentagon

The right pentagon (Posted on 2004-06-12)

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: ( You must be logged in to post comments.)

Subject	Author	Date
answer	K Sengupta	2008-07-11 11:54:09
Pai da ma	vije	2004-07-10 10:50:30
Solution	Gromit	2004-06-25 01:23:15
Solution	Tristan	2004-06-13 13:20:26
observation	rixar	2004-06-13 12:16:30
Solution	Nick Hobson	2004-06-13 10:26:15
Drawing	Tristan	2004-06-12 12:33:16
And the answer is ....	Larry	2004-06-12 12:30:42
OH...	Larry	2004-06-12 11:58:56
re: C is 90 and concave? - yes	Tristan	2004-06-12 11:54:16
C is 90 and concave?	Larry	2004-06-12 11:30:44

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