Circle Parts

Circle parts 
Area, circumference and degrees
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Slide 1: Slide
MathematicsLower Secondary (Key Stage 3)

This lesson contains 31 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Circle parts 
Area, circumference and degrees

Slide 1 - Slide

what are the differet parts of a circle

Slide 2 - Mind map


A
sector
B
diameter
C
Segment
D
radius

Slide 3 - Quiz


A
sector
B
diameter
C
radius
D
chord

Slide 4 - Quiz


A
sector
B
circumference
C
arc
D
chord

Slide 5 - Quiz


A
sector
B
segment
C
Arc
D
chord

Slide 6 - Quiz


A
sector
B
segment
C
tangent
D
chord

Slide 7 - Quiz


A
sector
B
segment
C
Arc
D
chord

Slide 8 - Quiz


A
sector
B
segment
C
tangent
D
diameter

Slide 9 - Quiz


A
sector
B
circumference
C
tangent
D
diameter

Slide 10 - Quiz

Circle
The parts of a circle are the radius, diameter, circumference, arc, chord, secant, tangent, sector and segment. A round plane figure whose boundary consists of points equidistant from a fixed point.
timer
4:00

Slide 11 - Slide

What is the diameter of a circle?
timer
0:30
A
A line segment going from one point of the circumference to another but does not go through the centre.
B
The distance across the circle going through the centre.
C
The distance from the centre of a circle to the outside.
D
The distance once around the circle.

Slide 12 - Quiz

What is the radius of a circle?
timer
0:30
A
A line segment going from one point of the circumference to another but does not go through the centre.
B
The distance across the circle going through the centre.
C
The distance from the centre of a circle to the outside.
D
The distance once around the circle.

Slide 13 - Quiz

Radius of A Circle
Radius is half the diameter

Slide 14 - Slide

What is the relationship between the radius and the diameter of a circle
A
Diameter = 2 x Radius
B
Diameter = Radius ÷ 2
C
Diameter = √Radius
D
Diameter = Radius²

Slide 15 - Quiz

What is the circumference of a circle?
timer
0:30
A
A line segment going from one point of the circumference to another but does not go through the centre.
B
The distance across the circle going through the centre.
C
The distance from the centre of a circle to the outside.
D
The distance once around the circle.

Slide 16 - Quiz

What is the area of a circle?
timer
0:30
A
A line segment going from one point of the circumference to another but does not go through the centre.
B
The space inside a 2D shape.
C
The distance from the centre of a circle to the outside.
D
The distance once around the circle.

Slide 17 - Quiz

What is the diameter of a circle if its radius is 6cm?
timer
0:15
A
3cm
B
12cm
C
10cm
D
12mm

Slide 18 - Quiz

Using the diameter
Use the formula C = πd to find the circumference if you know the diameter. In this equation, "C" represents the circumference of the circle, and "d" represents its diameter. 

That is to say, you can find the circumference of a circle just by multiplying the diameter by pi. Plugging π into your calculator will give you its numerical value, which is a closer approximation of 3.14 or 22/7.

Diameter means a straight line segment that passes through the center of the circle and has its endpoints on the sides of the circle.

Slide 19 - Slide

What is the circumference of a circle with a radius of 3cm?
(Remember C=2πr, where π=3.14)
timer
1:00
A
16.85cm
B
19.85cm
C
17.85cm
D
18.85cm

Slide 20 - Quiz

What is the circumference of a circle with a diameter of 10cm?
(Remember C=2πr, where π=3.14)
timer
1:00
A
30.42cm
B
31.42cm
C
32.42cm
D
33.42cm

Slide 21 - Quiz

What is the area of a circle with a radius of 4cm?

Slide 22 - Open question

What is the area of the circle


π=3.14

Slide 23 - Open question

What is the area of the circle


π=3.14

Slide 24 - Open question

What is the area of the circle


π=3.14

Slide 25 - Open question

How many degrees are there in one quarter of a circle?
A
90 degrees
B
180 degrees
C
270 degrees
D
360 degrees

Slide 26 - Quiz

How many degrees are three quarters of a circle?
A
90 degrees
B
180 degrees
C
270 degrees
D
360 degrees

Slide 27 - Quiz

How many degrees in 2 complete circles?
A
180 degrees
B
360 degrees
C
540 degrees
D
720 degrees

Slide 28 - Quiz

How many degrees in 2/3 a circle?
A
120 degrees
B
240 degrees
C
360 degrees
D
420 degrees

Slide 29 - Quiz

How many degrees in 1/10 of a circle?
A
30 degrees
B
36 degrees
C
45 degrees
D
90 degrees

Slide 30 - Quiz