Area/ circumference of a circle

Memory, Equations and etc;

Where is the arc in a circle

Part of the circle (not all the way round)

Where is the diameter in the circle

Through the middle

Where is the radius in a circle

Centre to edge

Where is the sector in a circle

Pizza slice

Where is the chord in a circle

Contains the segment

Where is the Tangent in a circle

Only touches the circle from the outside

Where is the circumference in a circle

In between the pizza slice (sector) and diameter

How do you calculate to find the circumference

TT x diameter

How can you remember Circumference = TT x diameter

Cherry pies are delicious

How do you find the area of a circle

TT x radius ² or TTr²

How can you remember Area = TT x radius²

Apple pies are too

How do you find the volume of a prism (3 steps)

1. Shade in the cross section

2. Find the area of the cross section (e.g triangle = bxh/2)

3. Multiply the area by length

What is a prism

3D shape with the same cross section all the way through

How do you get from meters to centimetres

x100

How do you get from centimetres to meters

divide by 100

How do you get from millimetres to centimetres

divide by 10

How do hou get from cm to mm

x10

How do you get from km to m

x1,000

How do you get from m to km

divide by 1,000

How do you get from kg to g

x1000

How do you get from g to kg

divide by 1000

How do you get from tonnes to kg

x1,000

How do you get from litres to ml (millilitres)

x1000

How do you get from millilitres to litres

divide by 1,000

A 2p coin has a mass of 7 grams. Find the total mass of £80 worth of 2p coins. Give your total answer in kg

1. £80.00 = 8,000

2. 8,000 divided by 2 = 4,000 coins

3. 4,000 × 7g = 28,000g

4. 28,000g divided by 1,000 = 28kg

Answer = 28kg

How do you find the area of a trapezium

½ (a + b) h

How many rotational symmetry’s does a trapezium have

None

What does a + b mean

Parallel

What is a hexagons interior angle

720 (split into triangles)

What is the total interior angle of a pentagon

540 (split into triangles)

Equation to find the area of a triangle

Bxh divided by 2

What does a traingle = (angle)

180

y = mx + c (what do each of these letters mean

• y and x = coordinates

• m = gradient (relates to steepness)

  • c = y intercept where it crosses the y axis

    Formula for a straight line

Finish the sentence: Parallel lines have the same ____ but different _____

• Gradient

• Y intercept