MODERATE EXERCISES
(4) An isosceles triangle has a perimeter of 42
cm. Express the area A of the triangle as a function of the length b of
the base of the triangle.
SOLUTION:
2x + b = 42
2x = 42 - b ==> x = 21 -b/2
(21 - b/2)2 = h2 + (b/2)2
441 - 21b + b2/4 = h2 + b2/4
h2 = 441 - 21b
h = 
A = b/2
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