Question
Find the area of a triangle, two sides of which are 8 cm and 12 cm and the perimeter is 38 cm .
Answer: Option C
:
C
Third side = perimeter - (sum of other two sides) =38 - 20 =18 cm
Semi perimeter of a triangle= Perimeter2=382=19cm
According to heron's formula,
Area of a triangle =√s(s−a)(s−b)(s−c)=√19(19−12)(19−8)(19−18)=√19×7×11×1=√1463cm2
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:
C
Third side = perimeter - (sum of other two sides) =38 - 20 =18 cm
Semi perimeter of a triangle= Perimeter2=382=19cm
According to heron's formula,
Area of a triangle =√s(s−a)(s−b)(s−c)=√19(19−12)(19−8)(19−18)=√19×7×11×1=√1463cm2
Was this answer helpful ?
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