When we use a pair of compasses to draw a circle, the distance between the needle tip and the pencil lead is the diameter of the circle. True or false.
False
The radius of a circle is 18 cm. What is the diameter?
36 cm
The figure below is made up of three idential circles. Point A, B, C are the center of the three circles. The radius of each circle is 5cm. What is the length of AB?
10 cm
In the figure on the right, point O is the centre. If the radius is 4 cm, find the area of triangle PQR.
16
The diameter of a circle is 12 cm. What is the radius?
6 cm
In the figure, point D is the center of the circle. Which line(s) are same in length?
AD, DB, and CD
When we use a drawing pin and a short string to draw a circle, the positiong of the drawing pin is the radius of the circle. True of fales.
False
What is triangle ABC?
An isosceles triangle
The radius of a circle is 20cm. What is the diameter?
40 cm
The length of AB is _______ times that of OC
2
It is a Chinese question. Find the diameter of the red circle.
8cm
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