Question

For rectangle ABCD, find m∠DEC.

Answer 1

Answer:

∠DEC = 118°

Step-by-step explanation:

∠ECD = ∠EDC = 31° (ΔDRC is isosceles because ED = EC)

∠DEC = 180° - 31° - 31° = 118° (all triangle interior angles add up to 180°)