Introduction to Circles

Q. Which of the following is/are true for a circle?

1. Diameter of a circle is twice the radius of the circle.
2. A circle is defined as the collection of all points that are equidistant from a fixed point(centre).
3. Radius of a circle is twice the diameter of the circle.
4. Circumference of a circle is $2\pi r$, where $r$ is the radius of circle.

Q. Match the parts of the circle with their correct definition.

1. Circumference
2. Center
3. Radius

Q. The centre point of a circle is at 15 cm distance from circumference of the circle. What is length of diameter of the circle?

1. 15 cm
2. 30 cm
3. 7.5 cm
4. 35 cm

Q. A circle is defined as the collection of points equidistant from a fixed point.

1. True
2. False

Q. Which of the following represent incorrect relationship?

1. AB = 2AC
2. BC = AC
3. AB = 2BC
4. $AB=\frac{AC}{2}$

Q. The length of a circle's boundary is called __

1. Circumference
2. Radius
3. Diameter
4. Centre

Q. Circumference of a circle of radius 7 cm is

1. 44 cm
2. 40 cm
3. 49 cm
4. 14 cm