1.

If two vertices of a triangle are (1,3) and (4,-1) and the area of triangle is 5 sq. units, then the angle at the third vertex lies in :

Answer» `A=1/2*b*h`
`5=1/2*5*h`
`h=2 unit`
from diagram
AC=BC
AD=Db=5/2
`tantheta=(5/2)/2=5/4`
`theta=tan^(-1)5/4`
`/_C=2tan^(-1)5/4`
`C in (0,2tan^(-1)5/4)`.
option a is correct.


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