Edexcel IGCSE Maths 复习笔记 4.6.2 Circle Theorems - Tangents
Edexcel IGCSE Maths 复习笔记 4.6.2 Circle Theorems - Tangents
What do I need to know about tangents
1. A radius and a tangent are perpendicular
- Note that perpendicular lines meet at right angles
2. Not strictly a circle theorem but a very important fact for solving some problems
- In this sense the tangents end at two points – the first point is where the two tangents meet and the other end is where each one touches the circle
- Notice because of the circle theorem above that the quadrilateral ROST is a kite with two right angles
Exam Tip
Add anything you can to a diagram you have been given – write in any angles and lengths you can work out, even if they don’t seem relevant to the actual question.Also, when asked to “give reasons” (this is very common), aim to quote an angle fact or circle theorem for every angle you find, not just one for the final answer.Likewise, for each angle you work out, try to assign an angle fact or circle theorem to it – giving the names/titles/phrases for each of these is exactly what the examiners want to see.
Worked Example
Worked Example
Worked Example
Worked Example
转载自savemyexam
以上就是关于【Edexcel IGCSE Maths 复习笔记 4.6.2 Circle Theorems - Tangents】的解答，如需了解学校/赛事/课程动态，可至翰林教育官网获取更多信息。
往期文章阅读推荐：
深耕九载！30+国际竞赛/课程讲义，硕博100%团队操刀，助力爬藤冲G5！
翰林AMC8视频课重磅上线！
国际竞赛真题资源免费领取
