Question

Find the area of a triangle two side of which are 8cm 11cm and the perimeter by herons formula

Answer 1

Answer:

13cm

Step-by-step explanation:

so to find third side let it be x

perimeter =s+s+s

32=11+8+x

32=19+x

32-19=x

13=x

Answer 2

Answer:

perimeter =a+b+c

32=8+11+c

32-19=c

13=c

• semi perimeter =a+b+c/2

= 32/2

=16cm

• area of triangle = √s(s-a) (s-b) (s-c)

=√16(16-8)(16-11)(16-13)

=√16*8*5*3

=√2*2*2*2*2*2*2*5*3

=2*2*2√2*5*3

=8√30cm^2