No, it is not.
3, 4 and 5 units of length
No.
There cannot be an integral set of values. The lengths need to be in the ratio 1 : sqrt(3) : 2.
Could a triangle and a rectangle ever be congruent? explain
Not in this Universe.
No.
Their values are: x = 2.4 and y = 0.6 which is a ratio of 4 to 1 and both triangles have an area of 7.8 square units
Isosceles triangle
This could be either an isosceles triangle or a right angled triangle.
Two sides of a triangle do not provide sufficient information to answer the question. The third side can range from 16 to 28 feet (excluding the two end values). At both those limits the area of the triangle will be close to zero. At the other extreme, if the missing length is sqrt(520) = 22.80 ft (approx), the area of the triangle will be 66 square feet. The answer could refer to any area between those two values.
Yes in equilateral triangle.
No because it would be an isosceles triangle