Review and the circumference of a circle

Lessons 41–42 · 2 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.

What is the circumference of a circle of radius 11 cm?

A circle has circumference 30π m. What is its diameter?

A quadrilateral with a circle inscribed has three consecutive sides 6, 8, 11. Find the fourth.

A circumscribed polygon has semiperimeter 20 and area 60. What is the inradius?

A bicycle wheel has radius 35 cm. How far does it travel in one full turn?