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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Vineet Patawari

Hi, I'm Vineet Patawari. I fell in love with numbers after being scared of them for quite some time. Now, I'm here to make you feel comfortable with numbers and help you get rid of Math Phobia!

36 thoughts to “Trigonometry Formula Memorization Trick”

  1. THIS STANZA CURLY BROWN HAIR TURNED PERMANENTLY BLACK …….. IS TOO GOOD……
    THANKS VINEET PATAWARI SIR
    I LIKE IT…PLZ SHARE MORE LIKE THIS WHICH HELP US TO LOVE MATHS……SO USEFUL……..

  2. Some people have=sin=p/h
    Curly brown hair=cos=b/h
    Till painted black=p/b

    BUT SOME PEOPLE HAVE CURLY BROWN HAIR TURNED PERMANENTLY BLACK …….. IS ALSO TOO GOOD……
    THANKS VINEET PATAWARI SIR
    I LIKE IT…PLZ SHARE MORE LIKE THIS WHICH HELP US TO LOVE MATHS……SO USEFUL……..

  3. It’s really boring … Instead of this , you should learn the Formulae by heart & you’ll never forget ,, dude !

    1. Its a very good method ! I had actually found it hard to remember the ratios .. But now …. I am sure I will never forget this trick!!!

  4. HINDI trick to memorize formula

    LAL/KKA

    L/K = LAMB/KARN = sin

    A/K = AADHAR / KARN = cos

    L/A = LAMB/ AADHAR = tan

    AKK/LAL

    A/L = AADHAR/ LAMB = COT

    K/A = KARN / AADHAR = SEC

    K/L = KARN/ LAMB = COSEC

  5. That was really helpful…….It helped me a lot during my exams…I liked it very much.It was easy to memorize……Thanks a lot for interesting mnemonic……

  6. 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..

  7. 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)

  8. 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

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