Form 1 Geometry - Revision

Form 1 Geometry - Revision

Chap 10 - Basic Geometrial Concepts

Chap 11 - Angles

Chap 12 - Intersecting Lines and Parellel Lines

Chap 10 Basic Geometrical Concepts

几何基本概念

10.3 Solid Figures

• Vertices 顶点

• Side / Edge 边

• Face 面

Fill in the Blank

Figure on the left shows an Octahedron.

In this solid, there are a total of ___ faces, ___ edges and ___ vertices.

Example of answer: 2,3,4

10.5 Line symmetry 线对称

• Axis of symmetry 对称轴

Fill in the Blank

How many line of symmetry does this figure have?

10.5 Point symmetry 点对称

• Center of symmetry 对称中心

Chap 11 Angles

角

11.3 Types of angles

角的种类

Fill in the Blank

Name the following angles x (in English):

x < 90°

x = 90°

90° < x < 180°

x = 180°

180° < x < 360°

x = 360°

Exclude the word "angle" from answer and seperate answer with ',' no space between answers, no capital letter

(Example answer: small,medium,big)

Fill in the Blank

试列出以下角 y 的中文名称:

y < 90°

y = 90°

90° < y < 180°

y = 180°

180° < y < 360°

y = 360°

11.3 Angles relationship

角之间的关系

Fill in the Blank

Please name the relationship between angles A and B (in English)

A + B = 90°

A + B = 180°

A + B = 360°

Example answer: acute,straight

(exclude 'angle', no space between answers, no capital letter)

Fill in the Blank

已知有两角A与B，试写出角的关系名称

A + B = 90°

A + B = 180°

A + B = 360°

Example answer: 锐角,平角

(no space between answers, no capital letter)

Chap 12 Intersecting Lines and Parallel Lines

相交线 & 平行线

Fill in the Blank

Write down (in English) the angles relationship between these angles :

a & d, a & e, c & f, c & e

Fill in the Blank

试写出以下两个角度的关系:

a & d, a & e, c & f, c & e

Fill in the Blank

In parallel lines, a pair of interior angles are ___ to each other.

Must know questions

Try them on your own!

Chapter 10

• Ex 10a (identify number of faces,edges,vertices)

• Revision 10 (identify axis of symmetry, center of symmetry)

Chapter 11

• Rmb how to construct angles with a protractor and compass

• NAMES & PROPERTIES of the types of angles & angles relationship!!

• Angles between hour-hand and minute-hand (example 6-10)

• Revision 11 (Q3, 4,8, 10)

Hour-hand & minute-hand questions (for next 2 slides)

• 5 mins = 30 degree = 1 "big block"

• 1 min = 6 degree = 1 "small block"

Eg 1. Small angle between hour-hand and minute-hand at 4pm.

• 4 "big block" = 4 x 30°= 120°

• 0 "small block" = 0 x 6° = 0°

• TOTAL = 120° + 0° = 120°

• try it yourself: 7pm and 10pm

Eg 2. Small angle between hour-hand and minute-hand at 8:30pm.

• 2 "big block" = 2 x 30°= 60°

• 2.5 "small block" = 2.5 x 6° = 15°

• TOTAL = 60° + 15° = 75°

• try it yourself: 5:30pm, 6:15pm

Chapter 12

• Shortest distance from a point to a line = the perpendicular distance (perpendicular means 90°)

• Ex 12a (Q7)

• NAMES & PROPERTIES of all angles relationship!

• Revision ex12 (Q5) + those parallel line exercise we did during tuition

Extra questions from just now