Question

no help nreded

Answer 1

so, they want you to get the intersection of three perpendicular line at the midpoint of the legs.

Answer 2

I give you steps
find midpoints of all of them
write the equation of the lines,
from those, write the equation of the perpendicular to the lines at the midpoints
solve the system of 3 perpendicular lines . the solution is the answer!!! good luck

Answer 3

just the first part!!!

Answer 4

to find the equation of the circle , you have to find the radius, that is the distance between O and A (or B or C)
and then plug them into the formula of (x-x_o)^2 +(y -y_o)^2 = radius ^2