No. In a right triangle, the two legs (the shorter sides) and the hypotenuse (longest side) obey the Pythagorean Theorem: a² + b² = c², where c is the length of the hypotenuse, and a and b are lengths of each leg.
So 7² + 7² = 49 + 49 = 98. But 9² = 81, so this is not a right triangle.
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45.5cm2
A scalene triangle
extra 6 dimensions of 10 dimensional spacetime
The area of a triangle is calculated by multiplying the base by the height and dividing the result by 2. In this case, the area of the triangle would be (5 cm x 7 cm) / 2 = 35 cm².
Using Pythagoras' theorem for a right angle triangle the other leg is 3 times the square root of 7