No.
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that's not a triangle
It is a right angle triangle with an hypotenuse of 39 and sides of 36 and 15. Area of triangle is 0.5*36*15 = 270 square units
The perimeter of a triangle is the sum of the lengths of its sides. In this case, the perimeter of the triangle with sides measuring 3 inches, 5 inches, and 7 inches is 3 + 5 + 7 = 15 inches.
No. There can be no isosceles right angled triangle with all three sides being rational numbers.
Add all three sides. Perimeter = 15 + 17 + 10 = 42