### Present Remotely

Send the link below via email or IM

• Invited audience members will follow you as you navigate and present
• People invited to a presentation do not need a Prezi account
• This link expires 10 minutes after you close the presentation

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

# Introduction to Trigonometry

No description
by

## Mr Mattock

on 15 November 2018

Report abuse

#### Transcript of Introduction to Trigonometry

Introduction to Trigonometry
Starter
Draw these triangles in your books and measure the marked angles. What do you notice?
Which function?
Which function links the marked angle to these sides?
Relationship between sides and angles.
8 cm
4 cm
10 cm
5 cm
Starter
Draw these triangles in your books and measure the marked angles. What do you notice?
8 cm
4 cm
10 cm
5 cm
Both the same value angle (about 27 degrees).
The sides of a right triangle can be related to
a particular angle.
hypotenuse (longest)
opposite
How many pairs of sides are there?
Relationship between sides and angles.
The sides of a right triangle can be related to
a particular angle.
hypotenuse (longest)
opposite
x
o
h

a
h

o
a
= sin x
= cos x
= tan x
L.O. - Link ratios of sides to trigonometric functions, and identify which function applies to which side.
Which function?
Which function links the marked angle to these sides?
ABC: sin

DEF: tan

GHI: cos

JKL: tan
Main Activity
Main Activity
Plenary
Explain why cos x = sin (90 - x). You may use the triangle below to help if you wish.
x
Plenary
Explain why cos x = sin (90 - x). You may use the triangle below to help if you wish.
x
90 - x
The side adjacent to x is opposite to 90 - x,
so for x is the same as for 90 - x.
a
h
o
h
Activities
Activity