2000 AMC 8 Problem 6

Attempt Problem 6 of the 2000 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2000 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

6.

Figure ABCDABCD is a square. Inside this square three smaller squares are drawn with side lengths as labeled. The area of the shaded L-shaped region is
77
1010
12.512.5
1414
1515
Answer: A
Concepts:area decompositionsquare (geometry)
Small hint:
Break the shaded L into rectangles
Big hint:
A 4×44\times4 square minus a 3×33\times3 square also works
Solution:
We can subtract out the areas of the top unit square, the bottom right unit square, and the top right 4×44 \times 4 square.
The shaded area in ABCDABCD is therefore 52−2⋅12−42=7. 5^2 - 2 \cdot 1^2 - 4^2 = 7.
Thus, A is the correct answer.
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