☰ Contents · Geometry

Angles and measuring them

Lessons 10–11 · 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
Ray OC inside ∠AOB, ∠AOC = 73°, ∠COB = 29°. Find ∠AOB.
2
∠AOB = 160°, ∠AOC = 3 · ∠COB, OC inside. Find ∠COB (degrees).
3
Find the smaller angle between the hands at 7:00 (30° per hour).
4
How many minutes is 1° 30′?
5
Draw 40° and 130° angles with a protractor, compare them and say which is smaller.