It is a right angle triangle because it complies with Pythagoras' theorem.
Area = 1/2*30*40 = 600 square cm
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The hypotenuse of an isosceles right triangle is 13 centimeters long. How long are its sides?
42 centimeters squared.
Perimeter = sum of three sides = 96 cm One side of 34cm, another of 25 cm so the third is 96 - 34 -25 = 37 cm
A small triangle, I guess.
It certainly could be, if, for example, the base of the triangle was 7 and the height was 4. But it could also be the area of a rectangle that's 7 long and 2 wide. Or the area of a square with sides about 3.7417 long.