Central Angle

Central Angle - an angle formed by 2 radii with the vertex (2 lines meet or point) at the centre of a circle.

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Area of a circle

Area of a circle - the area of the circle is the number of square units inside that circle.
Formula:
A = πr²

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A video about Area of a circle:

Circumference

Circumference - distance around the circle.
Formula:
C = πd
C = 2πr

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Diameter

Diameter -the distance across a circle through it's centre.
(you can get the diameter of a circle by doing   2r = d (2 x radius = diameter))

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What is radius?

Radius - a radius is the distance from the centre of a circle to it's outer edge.

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Constant- a number that does not change and it increases or decreases the value of an expression.

Example:

" b + 5 = 9 " 5 and 9 are constants.

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How to order fraction shapes from least to greatest

Well to make it easier here are the steps:

Steps:

1) Count the shaded parts of the whole.

2)Make it into a fraction with the numerator and the denominator.

3)Convert the fractions to decimals by dividing the numerator to the denominator.

4)You get a decimal.

5)Now you can order the shapes from least to greatest.

A video about ordering fraction shapes:

Expression

Expression- is any single number or variable, or combination of operations involving numbers and variables.

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How to convert fractions in different ways.

How to convert fractions in different ways.

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A video about converting fractions in a different way:

Ordering Decimals

Change these scrambled decimals from least to greatest.

Okay let's order decimals from least to greatest.

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A video about ordering decimals

Divisibility Rule for 5

Divisible- when a number can be divided by another number with no remainder.

Divisibility rule for 5:

All numbers ending at either 0 or 5.

Link about divisibility rule for 5 click here

Video about divisibility rules:

Number of the day

21. Use any two digits to make an proper fraction:

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Question #9 from Chapter 4 Review

The cost of a backpack is 60% of the cost of a shirt.

a) If the shirt costs $32.60, how much does the backpack cost?

Steps:

1.Change the percent to a decimal.

2.Multiply it to how much the shirt cost.

3.You get the answer.

.60 x $32.60

Answer is of how much the backpack cost: $19.56

b)What is the total price of a backpack and shirt before tax?

Step:

1.Add the answer from how much the backpack cost from Question A with how much the shirt cost.

$19.56 + $32.60 = $52.16

Answer is: $52.16

A video about turning percents to decimal:

A link about it click here

how to answer the question

According to an article in the newspaper, 35% of Regina residents like winter. If the population of Regina is 178 000, how many people like winter? Show two different ways to find the answer

Steps:

1.First start from 100%, because percentage is out of 100.

2.Second Divide or Multiply to get to the percentage asked.

3.Finally what ever you do on the right side do the same on the left side.

Another way to get the answer from the question:

Steps:

1.First you have to change your percentage asked to a decimal.

2.Then you Multiply it to the number mentioned at the population.

3.Then you get the answer.

A video about ratio tables:

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Order of Operations

How to answer today's question:

Step 1: First look for BRACKETS.

Step 2:Look for EXPONENTS.

Step 3: Look for DIVISION or MULTIPLICATION. (look from left to right)

Step 4: Then look for ADDITION or SUBTRACTION. (look from left to right)

Link: click here

Here's a video about it: