Question

Cati metri patrati are un triunghi cu doua laturi de 8 metri liniari si o latura de 13 metri ? 

Answer 1

A=√p(p-a)(p-b)(p-c)

p=(a+b+c)/2=  (8+8+13)/2= 29/2    =14,5

A=√29/2 * (29/2 -8) *(29/2 -8) *(29/2-13)=

=A=√29/2 *(29-16)/2 *(29-16)/2 * (29-26)/2=

=A=√29/2 * 13/2 *13/2 * 3/2=

= 13/2 * √87/4=

=13/2 *√87/2=

= 13√87/4=

=13*9,32/4=

=13*2,33=30,31 m²