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Lesson: Properties of Circles

In this lesson, we will learn how to identify and use parts of a circle, such as the radius, chord, and diameter, to solve problems.

Sample Question Videos

01:59

Worksheet • 25 Questions • 1 Video

Q1:

Find the length of 𝑀 𝑁 .

Q2:

Identify all the radii in the following circle:

  • A
  • B
  • C

Q3:

Given that 𝐴 𝐡 = 4 2 c m and 𝐸 𝐢 = 1 0 c m in the two concentric circles shown below, find the length of 𝐴 𝐢 .

Q4:

Suppose 𝐴 𝐡 = 1 3 2 c m , 𝑀 𝐷 = 4 4 . 5 c m , and 𝑀 𝐸 = 2 6 . 7 c m . What is the length of 𝐡 𝐷 ?

Q5:

Are all the radii of a circle equal in length?

  • Ano
  • Byes

Q6:

Is the diameter the longest chord in a circle?

  • Ano
  • Byes

Q7:

The length of the radius of a circle is the length of its diameter.

  • A twice
  • B half
  • C equal to

Q8:

What is the name of a chord that passes through the centre of a circle?

  • AA radius
  • BA diameter
  • CThe centre

Q9:

Which of the following correctly defines a circle?

  • AA circle is the set of points in a plane that are the same distance from the a given point called the center.
  • BA circle is the set of points in a plane that are different distances away from the center.
  • CA circle is the set of points in a plane that does not have any lines of symmetry.
  • DA circle is the set of points in a plane with a limited number of sides.
  • EA circle is the set of points in a plane with a single curved side.

Q10:

In the given figure, which of the following would represent the chord passing through 𝐡 and 𝐢 ?

  • A 𝐡 𝐢
  • B οƒͺ 𝐡 𝐢
  • C 𝐡 𝐢
  • D οƒͺ 𝐢 𝐡
  • E βƒ–     βƒ— 𝐡 𝐢

Q11:

Identify the radii of the circle.

  • A 𝑀 𝐸 , 𝑀 𝐹 , 𝑀 𝐺 , 𝑀 𝐻
  • B 𝑀 𝐸 , 𝑀 𝐹 , 𝐸 𝐹 , 𝑀 𝐻
  • C 𝐸 𝐺 , 𝑀 𝐻 , 𝑀 𝐺 , 𝐸 𝐹
  • D 𝐸 𝐻 , 𝐸 𝐹 , 𝐹 𝐺 , 𝐺 𝐻

Q12:

Identify the diameter of this circle.

  • A
  • B
  • C
  • D

Q13:

Given that 𝐴 𝐡 = 9 3 c m , find the radius to the circle 𝑀 .

Q14:

If the length of diameter 𝐴 𝐡 of circle 𝑀 is 158 cm, find the radius of the circle.

Q15:

Determine the diameter of the circle 𝑀 , given that its radius 𝐴 𝑀 = 4 9 c m .

Q16:

What is the radius of a circle whose diameter is 18?

Q17:

What is the diameter of a circle whose radius is 3?

Q18:

If the diameters of circles and are 2 cm and 6 cm, respectively, determine the length of .

Q19:

Circles 𝑀 and 𝑁 are of radii 11 and 18 and touch internally. Determine 𝑀 𝑁 .

Q20:

What is the name for any line segment in a circle whose endpoints intersect the circle?

  • A a quarter of
  • B chord
  • C twice

Q21:

If the length of the longest chord in a circle is 310 cm, what is its radius?

Q22:

Chords 𝐴 𝐡 and 𝐢 𝐷 meet at 𝐸 . If the lengths 𝐴 𝐸 , 𝐡 𝐸 , and 𝐢 𝐷 are 5, 6.4, and 12 respectively, what are the possible values for 𝐸 𝐢 ?

  • A8 or 4
  • B5 or 6.4
  • C4 or 6.4
  • D8 or 5

Q23:

Determine the chord(s) of the circle shown below.

  • A 𝑁 𝐸 , 𝑁 𝐹 , 𝑁 𝐺 , 𝑁 𝐾 , 𝑁 𝐿
  • B 𝐸 𝐹 , 𝐹 𝐺 , 𝐿 𝐻 , 𝐿 𝐺 , 𝐹 𝐾
  • C 𝐿 𝐺 , 𝐹 𝐾

Q24:

In the figure, 𝑀 𝐴 = 3 4 c m . Determine the length of 𝐢 𝐸 .

Q25:

What is the longest segment with endpoints on a circle of radius 66.9 cm?
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