In the figure, NPQR is a parallelogram and SQ = SR.
- Find ∠t.
- Find ∠u.
(a)
∠NSP = ∠NPS (Isosceles triangle)
∠t
= 180° - 45° - 45° - 69°
= 21° (Interior angles)
(b)
∠NSP
= 180° - 45° - 45°
= 90° (Angles sum of triangle)
∠u
= 360° - 90°
= 270° (Angles at a point)
Answer(s): (a) 21°; (b) 270°