Given: abcd is prove: a = c which of the following statements must be included in this proof? triangle abc congruent to triangle cda angle b congruent to angle d triangle abd congruent to triangle cdb.

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio