trignometry
Storyboard Text
- Hey, Ram mam is going to start a new chapter called introduction to trignometry
- the study of relationships between angles, lengths, of triangles.
- ohh! I heard it is a complicated chapter.
- students we will be dealing right angles triangles throughout the chapter
- dont worry guys our mam will make it easy for us.
- The study of relationships between lengths, and.The study of relationships between angles, lengths, and heights of trianglesTrigonometry is heights of triangles
- B
- adj
- Opp
- A
- INTRODUCTION TO TRIGNOMETRY
- sinA=BC/ACcosA=AB/ACtanA=BC/AB
- H
- C
- Mam shall I write the next 3 trignometric ratios
- students we have six trignometric ratios on the whole this are the 1st three basic ratios
- Mam what is the topic all about?
- To determine the value of sin 0°root(0/4)=0To determine the value of cos 0°root(4/4)=1°To determine the value of tan 0tan 0°= 0/1 = 0
- Sure Ram give it a shot!
- great job ram !now i have a question for all of u
- students now lest play a rapid quiz session
- cosecA=AC/BCsecA=AC/ABcotA=AB/BC
- sin30=cos45=tan30=cot45=cosec30=
- what is the difference between the 1st 3 ratio and the last 3 ratios?
- mam can i give a try
- Mam it is the inversre of sin,cos and tan
- students now who tell me the answers for the questions
- great job Mia!
- In △ABC,⇒tan45°=AC/BC⇒1=3000/BCBC=3000m
- sin30=1/2cos45=1/√2tan30=1/√3cot45=1cosec30=2
- wow ur are right shyam!!
- Again, in △EBD, ⇒tan30°= ED/BD=ED/BC+CD1/ 3 = 3000/3000+CD⇒3000+CD=3000/ 3 ⇒CD=3000( 3 −1)
- he angle of elevation of an airplane from a point on the ground is 45 After the flight of 15sec the elevation changes to 30 If the airplane is flying at a height of3000meters find the speed of the airplane.
- real life examples
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