**The
cunning Areas, December 98**

Because
it is Xmas time, I want to be cool with your brain cells! Here are
2 easy area finding problems:

**1)** Find
the area of the grey-shaded parallelogram AKCL in the fig.1) below.
Consider that: a) ABCD is a square with 3 cm side length; b) KD =
5 cm.

**2)** Now,
find the area of the polygon in fig.2). Consider that: a) AB = AD
= 3 cm; b) DC - BC = 1 cm.

You
have to use the shortest way to resolve these problems, a formula
with more than 2 terms (binomial) is not acceptable. Have I forgotten
something? ah …MERRY CHRISTMAS and HAPPY NEW YEAR!!!

Print
this page and try to solve these puzzles

©96-98, Sarcone & Waeber, Lausanne

**The
solutions are:**

**a)** 3(5-3)
= 6 cm^{2};

**b)** (3
x 3) - 1/4 = 8 3/4 cm^{2};

the formula is: AB=AD=c; BC=a; DC=b; |a-b|=n;

(c - n/2)(c + n/2) = c^{2} - (n/2)^{2}

^{More
details? feel free to contact us! }