Explanation: Fun fact: the areas and perimeters of triangles with legs 12
and 5 or 6 and 8 (talking whole numbers here) are equal. This triangle
has a related relationship; its legs are twice as long as 6 and 8, and its
area is equal to twice its perimeter. But you don’t need to know all that
for this problem. Just use the Pythagorean Theorem to find the height of
the triangle: 162 + h2 = 202, so h2 = 144, so h = 12. (Note that knowing
higher squares off the top of your head is useful.) So the area of the
triangle = ½ bh = ½ (16)(12) = 96, and twice the perimeter is 2(20 + 16
+ 12) = 96.