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 Blanks

10.5 Line symmetry 线对称

• Axis of symmetry 对称轴

Fill in the Blanks

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

11.3 Angles relationship

角之间的关系

Chap 12 Intersecting Lines and Parallel Lines

相交线 & 平行线

Fill in the Blanks

Fill in the Blanks

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