The circle. The central angle
Answers are for parents and teachers.
1
Two points split a circle into arcs in the ratio 2 : 7. How many degrees is the smaller arc?
80
2
Points A, B, C split a circle into three arcs: AB = 95°, BC = 120°. How many degrees is arc CA?
145
3
The diameter of a circle is 34 cm. How long is its radius (cm)?
17
4
A circle is divided into 5 equal arcs. How many degrees is each arc?
72
5
Explain the difference between a chord and a diameter in your own words.
A chord joins any two points of the circle; a diameter is a chord through the centre, and it is the longest chord.