Question

find the area othe tiangle, two sides of which are 15 cm and 28 cm and the perimeter is 84 cm .

Answer 1

Answer:

Step-by-step explanation:

Perimeter of the triangle =a+b+c

84=15+28+c

84-43=c

41=c

Area of triangle=A=s(s﹣a)(s﹣b)(s﹣c)

s=a+b+c/2

Solving forA

A=1

4﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=1

4·﹣154+2·(15·28)2+2·(15·41)2﹣284+2·(28·41)2﹣414=126

Answer 2

Step-by-step explanation:

Perimeter = A + B + C

84 = 15+28+ C

84 = 43 + C

C = 84-43

C = 41 cm

As we have the length of all the sides but we dont know the base and height....so we cant use the formulae of Area = 1/2× b × h

So here we need to use herons formulae

U can check the attachment

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Thank u :)