# 2012 S2-05 Maths Blog

## Monday, 8 October 2012

## Tuesday, 2 October 2012

## Friday, 28 September 2012

## Tuesday, 25 September 2012

### EOY

Here are some information about the paper:

Duration:

Total marks:

Duration:

**2 hr 30 min**Total marks:

**100**__40% of paper on Term 1 and 2 topics:__- Algebra and algebraic fractions
- Linear graphs
- Quadratic equations and graphs
- Area, perimeter, volume and surface area
- Pythagoras' Theorem
- Indices

__60% of paper on Term 3 and 4 topics:__- Standard form
- Congruence and Similarity
- Area and volume of similar figures and solids
- Basic trigonometry
- Matrices
- Probability
- Simultaneous equations and graphs
- Set notation and venn diagrams
- Direct and inverse proportion

### Set Language : Class CN-ECT activity

S205 Responses

**Questions:**

Do you agree with your friends' responses?

Some said F = J while others disagree? Comment.

## Wednesday, 19 September 2012

## Tuesday, 18 September 2012

## Wednesday, 5 September 2012

### Construction

Definition

A. Constructing Perpendicular Bisector

B Angles Bisector

# Perpendicular Bisector

# A perpendicular bisector of a line segment is a line segment perpendicular to and passing through the midpoint of (left figure). The perpendicular bisector of a line segment can be constructed using a compass by drawing circles centered at and with radius and connecting their two intersections. This line segment crosses at the midpoint of (middle figure). If the midpoint is known, then the perpendicular bisector can be constructed by drawing a small auxiliary circle around , then drawing an arc from each endpoint that crosses the line at the farthest intersection of the circle with the line (i.e., arcs with radii and respectively). Connecting the intersections of the arcs then gives the perpendicular bisector (right figure). Note that if the classical construction requirement that compasses be collapsible is dropped, then the auxiliary circle can be omitted and the rigid compass can be used to immediately draw the two arcs using any radius larger that half the length of .Angle Bisector

The (interior) bisector of an angle, also called the internal angle bisector (Kimberling 1998, pp. 11-12), is the line or line segment that divides the angle into two equal parts.

A. Constructing Perpendicular Bisector

B Angles Bisector

## Monday, 27 August 2012

### Direct and Inverse Proportion

Task 1
Part 1:
Explore the following graphs or information given and observe the following:
.1 patterns or repeated behaviours
.2 the variables exist in the information eg. time is changing
.3 the relationship between the variables
.4 is there a factor for change eg. values are tripled

**Comment**as a post**information 1**

**information 2**

**information 3**

**information 4**

**information 5**

Task 2: watch the following videos

Pa

## Thursday, 16 August 2012

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