The radius of a circle is 18 cm. What is the diameter?
36 cm
15
The diameter of a circle is 12 cm. What is the radius?
6 cm
15
The radius of a circle is 20cm. What is the diameter?
40 cm
15
Which is the center of the circle?
Point D
15
In the figure, point D is the center of the circle. Which line(s) are same in length?
AD, DB, and CD
20
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
25
What is triangle ABC?
An isosceles triangle
25
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
20
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
20
It is a Chinese question. Find the diameter of the red circle.
8cm
25
In the figure on the right, point O is the centre. If the radius is 4 cm, find the area of triangle PQR.