In this lesson, we talk about why it is that, for any point on the unit circle, x=cos(theta) and y=sin(theta).
In this lesson we show you how to construct the unit circle and the right angle triangle within using Geogebra which is important in future periodic function lessons.
In this video you will learn what radians are, and how to convert between degrees and radians.
Did you get a question where you have to find the hypotenuse of a triangle contained across the diagonal of a rectangular prism? Here is how you do it.
A modelling and problem solving question that involves the use of bearings, cosine rule, sine rule, and a bit of parallel lines geometry (alternate angles, cointerior angles etc).
This practice question requires knowledge in algebraic manipulation, trigonometry (especially the cosine rule), as well as bearings. Do not attempt this question until you are confident with the above concepts.
This tutorial teaches you how to use the cosine rule to find unknown angles and sides when 2 sides and the angle in between is given (where sine rule cannot be used).
This is my swing dance performance at King George Square, Brisbane. It was for the 70th year anniversary of US General Douglas MacArthur arriving in Brisbane. It was a very big event as documented in this article: https://theweekendedition.com.au/event-news/back-to-brisbane-in-the-war/ 這是我在布里斯班表演搖擺舞的影片。這個表演是為了紀念70年前美國名將麥克阿瑟來到布里斯班。這次的盛會在這篇文章裡有紀錄。https://theweekendedition.com.au/event-news/back-to-brisbane-in-the-war/ The type of dance we did was a combination of Lindy Hop, Charleston and Balboa. These …
Hi everyone. Today is my 36th birthday. Usually you get some gifts on your birthday but at the school where I teach, the culture is that on your birthday you bring your own cake for other people to enjoy. 大家好。今天是我三十六歲生日。你們大概生日都會拿到禮物，但在我教書的學校，生日是要自己帶蛋糕給別人吃。 Since I cannot provide a physical cake for you all, I will also do a …
Traditionally the area of a triangle is found using the perpendicular height. In this tutorial, you learn how to find the area of a triangle using 2 side lenghths and the angle in between, through the use of the sine ratio / rule.