# What You Need To Know To Do Well In Plane Geometry - Part 1

Plane Geometry is the new topic added in the new syllabus. There are hardly any calculations but lots of proving to be done.
We know students dislike proving, be it in Plane Geometry, Trigonometry, Quadratic Equations, Differentiation . . .

To score As in your exam, you must be good in proving.

Plane Geometry has proven to be a challenging topic for many students due to the nature of the diagrams, questions. Many a times, students do not know when to begin, not to mention which theorems to apply. I am going to share with you in this post on the key concepts you need to know at your fingertips for Plane Geometry.

There are 2 basic shapes in Plane Geometry: Triangle & Circle

In Triangle,

1. You must know the different Congruency Tests & Similarity Tests. These are extremely important in proving plane geometry questions. Teachers did not emphasize on this as students are expected to know these concepts well from E-Math. But I realize many many students did not like Congruency & Similarity as it involves proving (which is a very systematic approach of thinking) and hence many did not understand these 2 concepts well.
2. Mid point theorem (This is not exactly your mid point formulae in Co-ordinate Geometry)
3. D and E are the midpoints of AC and AB respectively.

4. Intercept theorem
5. When DE//CB, AD/DC = AE/EB

I will be adding on specific properties for circle in my next post. If you like to be updated, subscribe to my feed by clicking HERE

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### Ai Ling Ong

Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

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