# Maths revision cards

maths revision.

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## recognise types of angles

90degrees=?

smaller than 90degrees=?

180degrees=?

bigger than 180 but smaller than 360degrees=?

bigger than 90 but smaller than 180degrees=?

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90 degrees=right angle.

smaller than 90degrees=acute angle.

180degrees=straight line.

bigger than 180 but smaller than 360degrees=reflex angle

bigger than 90 but smaller than 180degrees=obtuse angle.

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## parrallel and perpendicular lines and angles

vertically opposite angles are...?

Alternate angles are..?

corresponding angles are...?

whats the tranversal line..?

definition of perpendicular..?

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equal

equal

equal

- a line that cuts through parallel lines

-at right angles; two lines at right angles to eachother

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## Recognise triangle types

Isosceles?

Equilateral?

Scalene?

Right triangle?

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Isosceles-2 sides are congruent

Equilateral-all the sides are congruent, all angles are congruent

Scalene-none of the sides are congruent, no congruent angles

Right triange-right angle(90degrees)

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## Expanding brackets, and collecting like terms.

a(a) = ?

5(2) = ?

5(a) = ?

a(b) = ?

5(a+2) = ?

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a(a) = a*a = a to the power of 2.

5(2) = 5*2 = 10

5(a) = 5*a = 5a

a(b) = a*b + ab

5(a+2) = 5a+10

5(a) + 5(2) = 5a + 10

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## Area of triangles, trapeziums and kites.

Area of a triangle?

Area of a trapezium?

Area of a kite?

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Area of triangle = bass times height divided by 2

Area of a kite= half the product of its diagonals.

Area of a trapezium=half the sum of the parrallel sides times the perpendicular height

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## Circumfrence using pie=3.14

whats a circumfrence?

whats the diameter?

whats the tangent line?

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circumfrence=perimetre of a circle

radius=distance from centre of a circle to the exterior

diameter=twice the size of the radius, chord which passes through the centre

tangent line= the line that goes all the way around the circle on the outside

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## pie=3.14 method

Example: diameter=7

To find the Circumfrence= pie times diamerter (pie*d) = 3.14*7

semi-circle:

C=pie*d divided by 2 then make sure to ADD the diameter.

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## shapes and there angle measurements

5sides=pentagion=540degrees

6sides=hexagon=720degrees

7sides heptagon=900degrees

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m=?

c=?

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c= y intercept

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## Inverse operation!

TIP: WHAT EVER YOU DO TO ONE SIDE YOU HAVE TO DO TO THE OTHER.

Example:

6+a=11

-6      -6

left with a=5 = the answer

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inverse operations:

+         -

-         +

times     divide

divide     times

B                            << always start from bottom <<<
I
D
M
A
S

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4          2y
--   =    ----
3           9

*9          *9

4    9
-- * ---    =    2y
3     1

36
----   =     2y
3

12 = 2y

y = 6

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BLAHHHHHH

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