a² = 85²-68²
a = 51 units.
a is the height of the ascribed triangle.
Calculating r, radius of the inscribed circle.
85r+51r+68r = 51*68
204r = 3468
r = 17 units.
b = 51-17
b = 34 units.
tanc = (68/51)
c = atan(68/51)
Therefore, shaded area yellow is;
½(68*51)-½(34*34)sin(atan(68/51)
= 1734-462.4
= 1271.6 square units.
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