![iwantcandy2002](/avatars/10644.jpg)
iwantcandy2002
23.07.2019 •
Geography
what is aids in africa considered by world health organizations
Solved
Show answers
More tips
- P Photography and Videography How to Choose the Perfect Photo Paper for Your Images?...
- H Health and Medicine What vaccines do children need?...
- H Health and Medicine Reasons for the Appearance of Warts: Everything You Need to Know...
- A Art and Culture How to Learn Screaming: Step-by-Step Guide for Beginners...
- H Health and Medicine Contraceptive Pills After 35: The Importance Of Choosing The Right Medication...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
Answers on questions: Geography
- B Business Place the four business functions in the order they appear along the value chain: Customer Service Design Marketing Production A. Design, Customer Service, Production, Marketing...
- E English Using present simple only, tell what you do in your neighbourhood usually? Using passive voice sentences only, evaluate the performance of current federal government in Pakistan? Explain...
- B Biology Compare sacred places in buddhism to those in islam. what do they have in common?...
- E English Hi im a 13 year old and I need a NOT CHEESY diar entry of a person who is in love...
- B Biology A Super nova is an explosion of a (?) mass star....
Ответ:
Ответ:
Step-by-step explanation:
Given sin 30° = 1/2, to check which of the statements is correct we will apply the Pythagoras theorem to a right angled triangle shown in the attachment.
using the SOH CAH TOA trig identity on the right angled triangle, ACD gotten from the equilateral triangle ABC;
From ΔACD, AD is the hypotenuse, DC is the opposite side to the angle 30° and AC is the adjacent.
From the diagram, sin30° = opp/hyp = DC/AD
sin30° = 1/2
Taking consideration of the acute angle 60°, the opposite side to the angle will be AC and the adjacent side will be CD.
According to CAH, cos 60° = adj/hyp = CD/AD
Given CD = 1 and AD = 2
cos60° = 1/2
This shows that sin30° = cos60° = 1/2
Note that ∠CDA and ∠DAC are angles complementary. Complementary angles are angles which have its sum to be 90°