In the figure, ∠VAE is a right-angled isosceles triangle. VE // XD , ∠CZY = 46°, ∠ACB = 42° and ∠YBZ = 61°. Find
- ∠VEA
- ∠ZXD
- ∠BDC
(a)
∠VEA
= (180° - 90°) ÷ 2
= 90° ÷ 2
= 45° (Isosceles triangle)
(b)
∠ACW = 45° (Corresponding angles, EV//CW)
∠ZCX
= ∠ACB + ∠ACW
= 42° + 45°
= 87°
∠ZXD
= 180° - ∠CZY - ∠ZCX
= 180° - 46° - 87°
= 47° (Angles sum of triangle)
(c)
∠BCD
= 180° - ∠ZCX
= 180° - 87°
= 93°(Angles in a straight line)
∠DBC = ∠ZBA = 61° (Vertically opposite angles)
∠BDC
= 180° - ∠DBC - ∠BCD
= 180° - 61° - 93°
= 26° (Angles sum of triangle)
Answer(s): (a) 45°; (b) 47°; (c) 26°