ABCD is a rectangle. On line segment AB, E is a point such that ∠ADE=17∘ and ∠BCE=29∘. What is the measure of ∠DEC (in degrees)?

Answer 1

∠ADE = 90-17 = 73°
∠ECD = ∠CEB = 29°
∠DEC = 180 - (73+29) = 78°

Answer 2

# 5 from HW
Given: x is the midpoint AY, and Y is the midpoint of XB.
Prove: AX YB
Satements
A
XY
Reasons
B
1.
2.
3.