Question

plz solve this question ​

Answer 1

Now you can substitute the value of a and b and then find the length.

Answer 2

here AC AND BD ARE MIDPOINTS THEN

AC=BD

i.e.;{(x1+x2)/2;(y1+y2)/2}=mid point

therefore

(-2+4/2;1+b/2)=(a+1/2;0+2/2)

(1;1+b/2)=(a+1/2;1)

(a;b)=(1;1)