The sides of the shaded triangle do not form a Pythagorean triple, therefore, it is not a right triangle.
What is a Right Triangle?
A triangle is a right triangle if the square of its longest side equals the sum of the square of the other two smaller sides, based on the Pythagorean Theorem.
Using the Pythagorean Theorem, find the lengths of the legs of the shaded triangle, and find out the sum of their squares equals the length of the longest side.
First leg of the shaded triangle = √(8² + 6²) = 10
Second leg of the shaded triangle = √(8² + 9²) = 12
The third side (longest side) of the shaded triangle is 9 + 6 = 15.
15² = 10² + 12²
225 = 244 (not true)
Therefore, the shaded triangle is not a right triangle.
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