## Tuesday, 29 August 2017

### Something more, something extra: Heron's Formula

This morning, we briefly talked about how to find area of a triangle in the absence of height, but when all three sides are given.

We can apply Heron's formula to find the area.
You would probably find the following sites interesting:

## Monday, 28 August 2017

### Mensuration: Transformation - from 2d to 3D

Question to be solved

What we learnt on 29 Aug 2017

### Mensuration: Volume of Cone and Pyramid

Cone
The volume of a cone fills up one-third of the volume of cylinder, i.e. we need three cones to fill up a cylinder.

Pyramid

## Saturday, 26 August 2017

### 6 AM Quiz: It's an Equation? It's a Line? It's Algebra!!!

Group score:

• Group 1: 3 points
• Group 2: 5 points
• Group 3: -
• Group 4: 17 points

Updated on 27 August 2017 (Sunday), 0830h

## Thursday, 24 August 2017

### Area of Parallelogram & Trapezium

Watch the following examples. Each comes with a question and the explanation on how to solve the problem.
1. Pause the question. Read the diagram carefully and think what formula would help you to solve for the unknown.
2. Think how you would solve the problem - you may need to write down an equation in order to solve for the unknown.
3. Next, continue to watch the clip and listen to the explanation. Is this similar to what you have thought of? Look out for the presentation of the working.

### Basic Geometry: How to present our working clearly? (II)

2015 S1 Maths Level Test 2 Question 5

Below illustrates different ways to present the working.

## Wednesday, 23 August 2017

### Basic Geometry: How to present our working clearly?

Suggested Presentation:
• Step-by-step working
• At any one time, only one angle property to be cited
• Lines may be extended or additional lines may be added, if necessary
• Other angles (that are not labelled) can be labelled you need to make reference to them along the way (as part of the working).

Alternatively,
You may label the angles and indicate the angle properties in the diagram. However, this must be clearly written.

However, you must not combine steps when presenting your working!
(although some of you process the steps very quickly)

When presenting your working in writing:
You must not cite more than one angle property for a single step.
You need to break down the steps, write the working clearly with any relevant angle property, if applicable.

## Tuesday, 22 August 2017

### [Discussion] Which Property Applies?

Let's refer to Assignments 1 & 2, and study the working provided.
Are you able to identify the relevant angle properties to explain the working?

### [Homework] 21 Aug: Basic Geometry

Part (I) Attempt the following via the GoogleForm by TODAY (22 August 2017)

Click HERE to access (2017 S1-01) Warming Up Question: Geometry (2)

Part (II) Submit the following assignments on THURSDAY (24 August 2017)
• Assignment 1 - hardcopy (as discussed during lesson on 22 Aug)
• Assignment 2 - hardcopy (as discussed during lesson on 22 Aug)

Optional: Challenging Questions

You may email a photo of your answers to me by the end of today (22 August 2017).

Remember to include clearly the Group Number.

## Thursday, 3 August 2017

### [Follow-up] Today's Lesson

Today, the lesson focused on deepening our understanding of median and mode through finding unknown values (of x). This is followed by a short discussion on Dot Diagram.

In the next lesson, we will move into stem-and-leaf diagram.

1. Self-Practice: Algebra - Factorisation Worksheet 1, 2 and 3

2. Practise Construction & Graphs (on your own) - you may refer to your textbook and workbook for questions

3. 6 AM Quiz is making a come-back this Saturday (starting from August).

4. Assignment 10.3

5. Attempt the task in the next Blog Post (last date for submission: 12 August)
6. Google Classroom - 3 Questions
Attempt the questions if you have not done so (deadline: 3 August 2017, Thursday)

7. Stem-and-Leaf Diagram

• Diagnostic Quiz on Stem-and-Leaf Diagram
• This is another opportunity to earn as much points for your group as possible through practice and making connection to real world :)
• Complete before Monday arrives.

For those who owe homework, you need to clear the items as soon as possible as the accumulated tasks/ assignments are snowballing in an alarming rate.

### How much do you know? .... Stem-and-Leaf Diagram

Click HERE to access the QUIZ to find out how much you now for Stem-and-Leaf Diagram.
Points will be contributed to the Group point.

## Wednesday, 2 August 2017

### Data Handling: How are data communicated in Real World?

Statistical representations are widely used to 'simplify' or 'summarise' data when presented along with reports.

An example is the a recent report on the "Alarming rise in losses on consumer prepayments" (Straits Times, 1 August 2017). Look at the bar chart presented. Did you notice how huge amounts is presented on the vertical axis?

In these two weeks (3 to 12 August), you shall look out for examples of charts used in reports any of the following and share with the class how charts are used in our daily life.

It would be even better if you could spot charts do not present the data appropriately or are misleading; and tell us why it's not appropriate or misleading.
Any duplicated charts, regards who posted it first will not be counted in group points.

How points are awarded:
• Chart: Appropriate OR Misleading [1 pt];
• Description of what chart attempts to communicate [1 pt];
• If it is a misleading chart - elaborate why it is misleading [1 pt]
• Acknowledge source (URL of source) [1 pt]