triangle author: kit date: 2013-12-18. introduction in this slide show, we will talk about the right...
TRANSCRIPT
TriangleAuthor: Kit
Date: 2013-12-18
Introduction
• In this slide show, we will talk about the right triangle and some properties• Pythagoras’ Theorem• Sin, Cos, Tan
Pythagoras’ Theorem
• In a right angle triangle, if we know the length of 2 out of 3 sides, then we can find the remaining side.
𝑎2+𝑏2=𝑐2
Pythagoras’ Theorem
• Please decide which is a? which is b? and which is c?
Pythagoras’ Theorem
• a = 3, b = 4, c = ?• a = 5, c = 13, b = ?• b = 8, c = 10, a = ?
Pythagoras’ Theorem
• Proof: Hint by area
Trigonometry
• Hypotenuse• Opposite• Adjacent• Angle
Trigonometry
• Determine whether they are H, O, A, ang
Trigonometry
• What is the relationship?
𝑡𝑎𝑛θ=OA
𝑐𝑜𝑠θ=AH
sinθ=OH
Trigonometry
• Find sin, cos, tan for the following triangle