ABC is isosceles triangle with BA=BC
D lies on Ac
ABD is an isosceles triangle with AB=AD
Angle ABD=72
Show that triangle BCD is isosceles.
You must give a reason for each for each stage of your working

I don't think triangle BCD is isosceles. I did my calculations well this time. Lol

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)