## Thursday, September 30, 2010

### geometry 3

posted by Mr Johari

Find the definition of the following
(a) line bisector
(b) angle bisector

Watch the following videos and learn how a line is bisected
Video 1

Video 2

Complete the worksheet on CONSTRUCTION.

(a) TASK 1: To construct: an angle of 60°.

(b) TASK 2: To construct: the angle bisector of a given angle.

(c) TASK 3: To construct: A line through R perpendicular to PQ.

(d) TASK 4: To construct: A line through R parallel to PQ.

(e) TASK 5: To construct: A line 3 cm from PQ and parallel to PQ.

## Monday, September 27, 2010

### Geometry 2

posted by Mr Johari

source: e-learning Mathematics activity

Now go to 102 Maths blog and comment on the posting by the students on the following question:
.1 no malicious comment
.2 must be responsible for your own comment - identify yourself
.3 focus on the process and answer not the person
.4 focus on the concept and the explanation given - check clarity and understanding

work to comment on
a. Lionel
b. Goh Jia Sheng

Recapitulation of Questions posted for your reference
Choose either 1: Question 2 or Question 3 or Question 4

Question 2:
Which of the given statements is correct? Justify your answer/s with examples.

A ) A square and a parallelogram are quadrilaterals.
B ) Opposite sides of a square and a parallelogram are parallel.
C ) A trapezoid has one pair of parallel sides.
D ) All the above

Question 3:

A quadrilateral is drawn on a piece of paper. It has one pair of opposite sides equal in length, the other pair not equal in length, and a pair of opposite angles that are supplementary1. Identify this figure, and justify your answer with reasons.

' sum of two angles equals 180degrees'

Question 4:
‘All parallelograms are squares?’ Do you agree with this statement?

### Geometry 1

posted by Mr Johari
Objectives:
the definition of points, segment, ray and plane

A. Task (odd numbered index only)
working independently and using the wall-wisher ACTIVITY 1 identify the a) attributes & characteristics and b) the symbol/notation used for
1. point
2. lines
3. segment
4. ray
5. plane

Objectives:
the fundamental angle properties.
B. Task (even numbered index only)
working independently and using the wall-wisher ACTIVITY 2 identify the following angle properties (please include a diagram to illustrate your responses)
1. complementary angle
2. supplementary angle
3. angles at a point
4. vertically opposite angles
5. corresponding angles
6. internal angles

REVIEW: The following video shows the differences between a right, acute, obtuse and straight angle.

## Sunday, September 19, 2010

### Angles and Parallel Lines 1

posted by Mr Johari
source: GCSEBitesize

# An angle can be defined as two rays or two line segments having a common end point. The endpoint becomes known as the vertex. An angle occurs when two rays meet or unite at the same endpoint.

1. How may degrees are there in one full turn?
2. Imagine you are facing North. You turn clockwise through 90 degrees. Which direction are you facing now?
3. Imagine the capital letter M. What letter does it look like when it's rotated 180 degrees?
4. An angle less than 90 degrees is known as ...
5. An angle between 90 degrees and 180 degrees is known as ...
6. If two of the angles inside a triangle are 90 degrees and 50 degrees, what is the third angle? What angle property/properties did you use in you reasoning?
7. Are the lines in the capital letter L parallel or perpendicular?
8. Will two parallel lines ever cross? Why?