☰ Contents · Geometry

The law of sines

Lessons 28 · 1 lessons · B. Xaydarov, E. Sariqov, A. Qo‘chqorov. Geometry, Grade 9 (textbook for general secondary schools), revised 4th edition. Huquq va Jamiyat Publishing, Tashkent, 2019
Answers are for parents and teachers.
1
∠A = 30°, ∠C = 90°, c = 14. Find a.
2
∠A = 45°, ∠B = 60°, a = 6. Find b.
3
∠A = 150° and a = 8. What is the circumradius?
4
A triangle has angles 30°, 60°, 90° and its shortest side is 4. How long is the longest side?
5
Why must a in a/sinA = 2R be the side opposite angle A?