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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)

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Question C is 90 and concave? | Comment 1 of 11

Angle C is a right angle?
it is concave at angle C?

I thought concave implied an angle greater than 180; so either there's a typo, or my definition of "concave" is wrong.

  Posted by Larry on 2004-06-12 11:30:44
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