Circles and Prisms

Question 1

Circular

Answer 1

In the form of a circle.

Question 2

Chord

Answer 2

A straight line segment joining two points on a circle or other curve.

Question 3

Arc

Answer 3

A fraction of a curve. Often used for a fraction of a circle.

Question 4

Segment

Answer 4

Within a circle, the area bound by an arc and the chord joining its two end points.

Question 5

Tangent

Answer 5

A line that touches a curve at one point only.

Question 6

Semicircle

Answer 6

Half of a circle

Question 7

Circumference

Answer 7

The length of a circle (its perimeter). If the radius of a circle is r units, and the diameter d units, then the circumference is 2 π r, or π d units.

Question 8

Radius

Answer 8

In relation to a circle, the distance from the centre to any point on the circle.

Question 9

Diameter

Answer 9

A line that goes through the centre of a circle joining two points on the curve

Question 10

Sector

Answer 10

The area within a circle bounded by two radius and one of the arcs they cut off.

Question 11

Irrational number

Answer 11

A number that is not an integer and cannot be expressed as a fraction. Examples: √3 and π

Question 12

Cuboid

Answer 12

A three-dimensional figure with six rectangular faces

Question 13

Cross section

Answer 13

The 2D shape created when the 3D shape is cut at a right angle
Example: In a cube, a square revealed when a plane cuts at right angles to a face.

Question 14

3D

Answer 14

Having length, width and depth.

Question 15

Prism

Answer 15

A 3D shape created by rectangles joining 2 identical 2D shapes together (the cross section is always the same)

Question 16

Cylinder

Answer 16

A prism where the cross section is a circle

Question 17

Area

Answer 17

A measure of surface.

Question 18

Face

Answer 18

One of the flat surfaces of a solid shape.

Question 19

Surface Area

Answer 19

The sum of all areas of each face of a 3D shape

Question 20

Volume

Answer 20

A measure of three-dimensional space.