Two sides of a triangle are not sufficient to determine its area.
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The height has not been given but the area of the triangle is: 0.5*height*base
If one side of the triangle is 8cm then the other side is 7cm because 0.5*8*7 = 28 square cm
56 cm2 * * * * * Only if these are the shorter legs of a right angled triangle and there is no justification for making that assumption. Two sides of a triangle are not sufficient to determine its area.
The area of a triangle = 1/2*base*height = 1/2*5*7 = 17.5 cm2.The fact that it is an isosceles triangle is irrelevant.