Heron's formula can be used to find the area of a triangle if the lengths of the three sides are known. If the lengths of the three sides are​ a, b, and c units and the semiperimeter is s equals StartFraction a plus b plus c Over 2 EndFraction ​, then the area of the triangle is given by StartRoot s left parenthesis s minus a right parenthesis left parenthesis s minus b right parenthesis left parenthesis s minus c right parenthesis EndRoot. Use​ Heron's formula to find the areas of the right triangles with the sides given. a. 25 ​cm, 7 ​cm, 24 cm

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