# Maths-hard topics

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55% of 360 = 50% + 5% 360/2=180 5%=180/2=18 180+18=198
Percentage Trick - Solve precentages mentally - percentages made easy with the cool math trick!
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56% of 440= 50% + 1%*6= 50%= 440/2=220 1%=4.4 6%=4.4*6=26.4 56%=220+26.4=246.4
Percentage Math Trick 2 - Solve percentages mentally - percen
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Calculating the length of a line from coordinates
L=/(x2-x)2+(y2-y)2
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Calculating the midpoint of a line
( x1+x2/2 ' y1+y2/2 )
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Formula for finding the gradient of a line joining two points
m= y2-y1/ x2-x1
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The y intercept
The y intercept is the point at which the line crosses the y axis (represented by a c)
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The equation of a straight line
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Circumference of a circle
(pie)d or 2(pie)r2
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Circumference of semi-circle
(circ. of entire circle) (pie)/ 2
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Area of triangle
bh/2
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Volume of a cylinder
(pie)r2l or (pie)r2h
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Volume of a cuboid
lxbxh
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Volume of a prism
C.S.A x l
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Area of a sector
(theta)/360 x (pie)r2
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Arc length
(Theta)/360 x 2(pie)r
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Perimeter
(theta)/360 x 2(pie)r + 2r
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## Other cards in this set

### Card 2

#### Front

Percentage Math Trick 2 - Solve percentages mentally - percen

#### Back

56% of 440= 50% + 1%*6= 50%= 440/2=220 1%=4.4 6%=4.4*6=26.4 56%=220+26.4=246.4

### Card 3

#### Front

L=/(x2-x)2+(y2-y)2

### Card 4

#### Front

( x1+x2/2 ' y1+y2/2 )

m= y2-y1/ x2-x1