49cm2
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The area is the side x side = 49 side = 7cm ( sqrt of 49) perimeter is some of sides = 7 + 7 + 7 + 7 = 28 cm
A scalene triangle.
98 cm^2
If one side of the triangle is 8cm then the other side is 7cm because 0.5*8*7 = 28 square cm
You can imagine it to be the area of a square figure (four equal sides and angle beween adjacent sides is 90 degrees) whose side is7 cm