Where is the semi-perimeter??
Geometry
Level
2
The difference between the semiperimeter and three sides of a triangle are 8 cm, 7 cm, and 5 cm.If the area of the triangle is ??
20
20
21
21
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1 solution
let the side of the triangle be a ,b,c
s-a=8 s-b=7 s-c=5 adding the above equations and substituting a+b+c =2s we get s=20
then the area by HERONS FORMULA