The figure shows a rectangle ABCD. ∠ADE = 56° and ∠BDC = 43°. Find
- ∠BDE
- ∠ABD
(a)
∠BDE
= 56° + 43° - 90°
= 9° (Overlapping angles)
(b)
∠ADB
= 56° - 9°
= 47° (Overlapping angles)
∠ABD
= 180° - 90° - 47°
= 43° (Angles sum of triangle)
Answer(s): (a) 9°; (b) 43°