Trigonometry Formula Memorization Trick
I learned this shortcut memory trick from my Maths teacher in school. Recently while interacting with a class X student, I realized they have to mug up all the trigonometric ratios. This can be frustrating and can create a phobia or dislike for an interesting subject like Trigonometry at the very onset.
To use this memory trick, you need to memorize this simple mnemonic -
Some people have curly brown hair turned permanently black
That’s all you need to memorize to register the trigonometrical ratios in your mind forever. So here you go,
Some People Have
S = P/H
Sin = Perpendicular / Hypotenuse
Curly Brown Hair
C = B/H
Cos = Base/Hypotenuse
Turned Permanently Black
T = P/B
Tan = Perpendicular/Base
There are 3 more ratios: Cosec, Sec and Cot. For these, just remember that -
Cosec is the reciprocal of Sin; or Cosec = 1/Sin = H/P
Sec is the reciprocal of Cos; or Sec = 1/Cos = H/B
Cot is the reciprocal of Tan; or Cot= 1/Tan = B/P
In my next post I’ll write about a simple memory trick for memorizing the value of all major angles of different trigonometry ratios like sin30, cos45, tan60, etc.
Update on 4th September, 2011 - as promised above here's the new post - http://www.quickermaths.com/memory-tricks-for-trigonometry/
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I am Vineet Patawari - PGDM (IIM Indore), ACA, B.Com(H). My passion for Mathematics, specially Vedic Maths encouraged me to start QuickerMaths
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April 10th, 2013 - 20:48
SOHCAHTOA
where
soh:-
S=O/H
Sin = opposite / Hypotenuse
cah:-
C = A/H
Cos = adjacent/Hypotenuse
toa:-
T = O/B
Tan = opposite/adjacent
January 12th, 2013 - 19:43
nice to memorize it
June 22nd, 2012 - 19:27
it’s very gud trik ……
March 31st, 2012 - 13:53
superb it help me very much
July 26th, 2012 - 17:27
REally.?????
December 4th, 2011 - 17:57
OAO/HHA=sin???,cos?,tan? ?=(Old )/(Hritik ) And/His Old/Amisha
Where O = opposite; A = adjacent and
H = hypoteneous
OR
(Pandit Badri Prasad Bole Har Har)/(Har Har Bole Prasad Badri Pandit)= PBPBHH/HHBPBP
Is shortcut to learn trigonometric ratios where P = Perpendicular or opposite side
B = Base or adjacent side of triangle
And H = Hypotaneous of right angled traingle..
December 4th, 2011 - 14:57
nice tricks i like it thankxxx………..
September 27th, 2011 - 17:14
superb trick i liked it
September 10th, 2011 - 10:40
Simple Formula to remember
1. LAL/KKA
Sin = L/K
Cos = A/K
Tan = L/A
2. KKA/LAL
Cot = A/L
Sec = K/A
Cosec = K/L
where:-
L=Lumb(Perpendicular)
K=Karna(Hypotenuse)
A=Adhar(Base)
September 5th, 2011 - 12:10
very easy
September 4th, 2011 - 00:34
really easy to remember
pl. post the rest tricks for sharing
thanks
August 30th, 2011 - 21:35
yah its nice
August 30th, 2011 - 20:14
Pakistan/hindustan
Bhookha/hara
Pyasa /bhara
August 28th, 2011 - 18:47
sin(sona)=p(pandit)/h(har)
cos(chandi)=b(badri)/h(har)
tan(tole)=p(prasad)/b(bhole).
learn like in sequence:-say pandit badri prasad har har bhole sona chandi tole
August 29th, 2011 - 08:53
Thanks Kodawala for presenting a different mnemonic!
April 10th, 2013 - 20:47
SOHCAHTOA
where
soh:-
S=O/H
Sin = opposite / Hypotenuse
cah:-
C = A/H
Cos = adjacent/Hypotenuse
toa:-
T = O/B
Tan = opposite/adjacent
August 28th, 2011 - 11:43
wow it is interesting
August 27th, 2011 - 17:25
i like it…