☰ Contents · Geometry

Angle types. Adjacent and vertical angles

Lessons 12–13 · 2 lessons · Geometry Grade 7, corrected and expanded 3rd edition. Yangiyo‘l Poligraf Servis, Tashkent, 2017 (approved by the Ministry of Public Education)
Answers are for parents and teachers.
1
Find one of the three equal angles into which rays divide a 150° angle.
2
One adjacent angle is 50° bigger than the other. Find the smaller.
3
Adjacent angles are in ratio 1 : 5. Find the larger.
4
Two lines intersect; one angle is 3x and an adjacent one is x + 60°. Find x.
5
Write the proof of “vertical angles are equal” in your own words.