 |  Circles 48 Flashcards |  Start |
 | A circle is defined as a simple closed curve where all points are equidistant from a fixed point called the ___. |  Card: 1 / 48 |
| Centre | Card: 2 / 48 |
| The distance between the centre of a circle and any point on the circumference is known as the ___. | Card: 3 / 48 |
| Radius  | Card: 4 / 48 |
| The longest chord of a circle is called the ___. | Card: 5 / 48 |
| Diameter  | Card: 6 / 48 |
| True or False: The radius of a circle is twice the length of the diameter. | Card: 7 / 48 |
| False. The radius is half the diameter. | Card: 8 / 48 |
| What is the difference between a minor arc and a major arc in a circle? | Card: 9 / 48 |
| A minor arc is the shorter segment of the circle, while a major arc is the longer segment. | Card: 10 / 48 |
| Fill in the blank: A ___ is a line segment whose endpoints lie on the circle. | Card: 11 / 48 |
| Chord  | Card: 12 / 48 |
| Riddle: I am a part of a circle and named by three points, two are my endpoints, and one lies in between. What am I? | Card: 13 / 48 |
| An arc | Card: 14 / 48 |
| What is the relationship between diameter and radius in a circle? | Card: 15 / 48 |
| The diameter is equal to 2 times the radius. | Card: 16 / 48 |
| An arc that is longer than a semicircle is called a ___. | Card: 17 / 48 |
| Major arc | Card: 18 / 48 |
| True or False: A circle can be defined as a curve where points are at varying distances from the center. | Card: 19 / 48 |
| False. All points in a circle are at the same distance from the center. | Card: 20 / 48 |
| What is the formula for calculating the circumference of a circle? | Card: 21 / 48 |
| The circumference of a circle is calculated using the formula C = 2πr, where r is the radius. | Card: 22 / 48 |
| Fill in the blank: The diameter of a circle is equal to ___ times the radius. | Card: 23 / 48 |
| 2 | Card: 24 / 48 |
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| True or False: The interior of a circle includes all points that are farther away from the center than the radius. | Card: 25 / 48 |
| False. The interior of a circle includes all points that are closer to the center than the radius.  | Card: 26 / 48 |
| What distinguishes concentric circles from other circles? | Card: 27 / 48 |
| Concentric circles have the same center but different radii.  | Card: 28 / 48 |
| Riddle: I am a closed curve where every point is equidistant from the center. What am I? | Card: 29 / 48 |
| A circle. | Card: 30 / 48 |
| When drawing a circle with a compass, what is the first step? | Card: 31 / 48 |
| Fix a pointed pencil in the compass and place the metal tip at a point on a ruler to measure the radius. | Card: 32 / 48 |
| The point 'O' in circle geometry typically represents what? | Card: 33 / 48 |
| The center of the circle. | Card: 34 / 48 |
| Fill in the blank: Circles with the same center but different radii are called ___ circles. | Card: 35 / 48 |
| Concentric | Card: 36 / 48 |
| If the radius of a circle is 3 cm, what is the circumference? | Card: 37 / 48 |
| The circumference is 6π cm. | Card: 38 / 48 |
| Explain the relationship between the radius and the diameter of a circle. | Card: 39 / 48 |
| The diameter is twice the length of the radius; it can be expressed as d = 2r. | Card: 40 / 48 |
| The radius of a circle is 3.4 cm. What is the diameter? | Card: 41 / 48 |
| Diameter = 2 × radius = 2 × 3.4 cm = 6.8 cm. | Card: 42 / 48 |
| Circumference of a circle can be calculated using which formula? | Card: 43 / 48 |
| Circumference = 2 × π × radius. | Card: 44 / 48 |
| If the circumference of a circle is 44 cm, what is the radius? | Card: 45 / 48 |
| Using the formula Circumference = 2 × π × radius, we can rearrange to find radius = Circumference / (2 × π). For a circumference of 44 cm, radius = 44 cm / (2 × 22/7) = 7 cm. | Card: 46 / 48 |
| The diameter of a circle is 2.8 cm. What is the circumference? | Card: 47 / 48 |
| Circumference = π × diameter = (22/7) × (2.8 cm) = 8.8 cm. | Card: 48 / 48 |
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