Home » Maths Tricks » 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/


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!


  1. vaibhav says:

    very useful thanks;;;;;;;

  2. […] Trigonometry formula memorization trick […]

  3. Nancy says:

    Very informative post indeed.. being enrolled in: http://www.wiziq.com/course/7618-full-preparation-for-class-10-mathematics
    I was looking for such articles online to assist me and also your post helped me a lot.:)

  4. firoj says:

    it’s very gud trik ……

  5. simran says:

    superb it help me very much

  6. prof: bhanu tiwari says:

    OAO/HHA=sin???,cos?,tan? ?=(Old )/(Hritik ) And/His Old/Amisha
    Where O = opposite; A = adjacent and
    H = hypoteneous
    (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. Tejal says:

    nice tricks i like it thankxxx………..

  8. jaya prakash says:

    superb trick i liked it

  9. deepaktailong says:

    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


  10. kailash says:

    very easy

  11. [...] Tricks for Trigonometry In the post titled Trigonometry Formula Memorization Trick, I agreed to write about a simple memory trick for memorizing the value of all major angles of [...]

  12. sanjay says:

    really easy to remember
    pl. post the rest tricks for sharing

  13. gitanshu says:

    Pyasa /bhara

  14. Kodawala Rahul says:




    learn like in sequence:-say pandit badri prasad har har bhole sona chandi tole

  15. anitha says:

    wow it is interesting

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Who is behind QuickerMaths?

I am Vineet Patawari - PGDM (IIM Indore), ACA, B.Com(H). My passion for Mathematics, specially Vedic Maths encouraged me to start QuickerMaths

I believe that if trained properly using powerful tools like Vedic Maths, the immense intellect of human mind can be ignited instantly - find out more

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