With math !

what is the measure of angle ced?

p over 2, because triangle abc is congruent to triangle dce
p + 70 degrees, because triangle abc is similar to triangle dce
110 degrees − p, because triangle abc is congruent to triangle dce
p, because triangle abc is similar to triangle edc

The answer is P, because if both triangles are right angled and have the angle of 70°, then because angles in a triangle equal 180° you can say that they will be the same as 70 + 90 = 160, and 180 - 160 = 20, which is the same steps for both triangles. I hope this helps! Let me know if I need to explain it further or anything :)