গণিতের শর্টকাট ফর্মুলার (ShortCut Math Techniques) এক্সক্লুসিভ বাংলা ই-বুক ।বিসিএস ,ব্যাংকার্স রিক্রুটম্যান্ট, IBA,MBA,GMATও GRE ও যে কোন প্রতিয়োগিতামূলক পরীক্ষার প্রস্ততির জন্য
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Auto /Automatically Scroll ( Ctrl + Shift + H ) up Arrow down Arrow
Straight line ( )Ray ( )Line Segment ( )Similar to Almost Equal to
Is Equivalent to / Congruent Angle Right Angle Measured Angle
Perpendicular To Is Parallel to Therefore / Hence Since / Because /
Triangle Rectangle/Square Circle
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/gmail/skype: - http://tanbircox.blogspot.com Euclids (): Elements
13 , 300 ,
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/gmail/skype: - http://tanbircox.blogspot.com 90 , 180 , DEF ACBAB
|| CD EF (Transversal) , AGF = DHE DGF = CHE
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/gmail/skype: - http://tanbircox.blogspot.comAB || CD EF
(Transversal) , AGF = CHF DGF = DHF ABC , BAC =B , ABC = B , ACB =
C AB= c , BC = a AC = b
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/gmail/skype: - http://tanbircox.blogspot.comABC A , B c < 90ABC
A C < 90 B = (900< < 1800)
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/gmail/skype: - http://tanbircox.blogspot.comABC B = = 900 A + C =
900 A = C = 900 , 900 = + = + 3:4:5 , 5:12:13 , 8:15:17 , 7:24:25 ,
Multiple [ = + , 5 = 4 + 3 , 25 = 25 , ]
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/gmail/skype: - http://tanbircox.blogspot.comABC AB BC CAABC AB =
AC BC b = c B = C , , ABC AB = BC = AC a= b = c A = B = C =600
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/gmail/skype: - http://tanbircox.blogspot.com , , ( ) 4 3600 A +B
+C + D = 3600
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/gmail/skype: - http://tanbircox.blogspot.com , n (Interior Angles)
n = ( 2n 4) 900 = n 2 1800 = 180 )0 , n = 3600 = ( )0Area of
HexagonA = 2.6 s2[where s is the length of one side]Area of
OctagonA = 4.83s2[where s is the length of one side]
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/gmail/skype: - http://tanbircox.blogspot.com = a = b , A = = a b S
= 2 ( + ) = 2(a + b) d = + = = a A = = a a = A= = [ = 2 = 2 ] S =
2(a + a) = 4 a d = + = 2 a
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/gmail/skype: - http://tanbircox.blogspot.com =a h = = a h a , b =
a b n d X = (AC) (CG) = d X d1 d2 , = a , b d = 2 ( , ) [ , = S = =
] = 2 ( + ) BD = d1 AC(d2) = + = + + [ CF =DE][DE AB DE = ][BF BF =
]
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/gmail/skype: - http://tanbircox.blogspot.com = = a AC= d1 BD= d2 A
= ( ) = S = 4 AB =a DC = b CE = h = = (AB + CD ) CE = (a +b) h
=
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/gmail/skype: - http://tanbircox.blogspot.com BC= a AD = h = (BC)
(AD) = a h , = = (a) (b) = a b n = b c n = c a n ABC BC=a , AB =c
AC=b (2S) = = a+b+c S == = / / = b = a = 4 / ( = 60) / = a = = 3
a
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/gmail/skype: - http://tanbircox.blogspot.com = = [ = ] ABC l , m n
S = = ABC a , b c ; =R A = + + ABC a , b c ; =R A = , = =3.1416() =
1801= (S) (d)
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/gmail/skype: - http://tanbircox.blogspot.com (r) = 2 = 2r = = = 2
r = 2 r r S 360 = 2 r ,, ,, ,, ,, ,, = = S = r S ,S = r [ 1= 180] =
r , = r S , =
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/gmail/skype: - http://tanbircox.blogspot.com OA= r1 OB = r2 , = =
r1 r2 = 2
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/gmail/skype: - http://tanbircox.blogspot.com =a , =b = c =d (Area
of the Whole Surface)= = 2 (ab +bc +ca) (Volume) = = a b c , d = +
+ = = = a =d (Area of the Whole Surface)= = 6 (Volume) = = , d = 3
a
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/gmail/skype: - http://tanbircox.blogspot.com (Right Circular) BC =
r , AB= h AC = l l = + [ = + ] = (2r) (l) = rl = r + (Whole
Surface) = ( l) + ) = r (l +r) (Volume): = ) (h) = h
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/gmail/skype: - http://tanbircox.blogspot.com (Right Circular) OB
=r OC =h = (2r) (h) = 2 h = (2rh) + (2 ) (Whole Surface) = 2r(h+r)
= ( ) (h) = h
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/gmail/skype: - http://tanbircox.blogspot.com n = = = = = = n = = n
n n + = 1 n = 1 = 1 n = 1 = 1 + = 1 = 1 = 1 + = 1
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/gmail/skype: - http://tanbircox.blogspot.com sin 0 1212321cos 1
3212120tan( ) 0 131 3 cot( ) 3 1 130sec( ) 1 232 2 Cosec ( ) 2 2
2310, 1, 2, 3, 4, 4 , , , , n n 0 n 30 n 45 n 60 n 90 0,1 sin cos
sin cos tan 1 n +1 1 +1 1 -1 n
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/gmail/skype: - http://tanbircox.blogspot.com sin / cos / tan {n 90
) } {n 90 } (