Question 1127586
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The answer (area of the triangle) is NOT 17.<br>
The problem says he doesn't know the length of the hypotenuse; that means the 3cm and 5cm are the lengths of the legs.  The area of the triangle is then one-half the product of the lengths of the two legs.<br>
A = (1/2)(3)(5) = 15/2 or 7.5cm^2