AB=21; AD=28. What is the value of AC+BD?
The length of AC and BC is 35 by Pythagoras theorem, so that the sum of both gives 70
do pathagrarian therum which is A^2 +B^2=C^2 21^2+28^2 =C^2 1225=C^2 Square root it both sides 35=C 35+35=70 70 is your answer
