Question

Calculate the area of a triangle with sides 15cm, 36cm and 39cm

Answer 1

s=a+b+c/2
s=15+36+39/2
s=45
area=√s(s-a)(s-b)(s-c)
=√45(45-15)(45-36)(45-38)
=√45(30×9×7)
=√45(3×10×3×3×7)
=45√42

Answer 2

s(semi perimeter)=15+36+39/2
=45cm
Area of triangle=√s.s-a.s-b.s-c
√45x30x9x6
√15x3x15x2x3x3x3x2
=15x3x3x2
=270cm^2
Answer=270cm^2