☰ Contents · Geometry

Final review

Lessons 55 · 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
What is the area of a triangle with sides 9, 10, 17 (Heron’s formula)?
2
a = 10 and ∠A = 30°. Find the circumradius R.
3
What is the area of a 90° sector of a disc of radius 8?
4
What is the tangent length to a circle of radius 4 from a point 5 from the centre?
5
Why is the ratio of areas of similar figures equal to k²?