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Question

Mathematics Question on Exterior Angle Of A Triangle And Its Property

Find the value of the unknown exterior angle x in the following diagrams:
list of diagrams

Answer

(i) x=50°+70°x = 50° + 70° (Exterior angle theorem)
xx = 120°120°

(ii) x=65°+45°x = 65° + 45° (Exterior angle theorem)
= 110°110°

(iii) x=40°+30°x = 40° + 30° (Exterior angle theorem)
= 70°70°

(iv) x=60°+60°x = 60° + 60° (Exterior angle theorem)
= 120°120°

(v) x=50°+50°x = 50° + 50° (Exterior angle theorem)
= 100°100°

(vi) x=30°+60°x = 30° + 60° (Exterior angle theorem)
= 90°90°