BMAT Maths

What do angles on a straight line add up to ?

180 degrees

How is the circumference of a circle given ?

2pir

How do you work out the length of an arc ?

2pir x/360 Where x is the angle at the centre of the arc

What do angles at a point add up to?

360 degrees

How do you work out numbers that are inversely proportional

A = 1/b A=k/b

How is a quadratic equation set out ?

Ax^2 + bx + c = 0 Factorised: (Mx+n)(px+q) = 0

How is HCF worked out ?

Combine the prime factors that are shared between all numbers

How do you work out X% of a number?

Divide X by 100 and times that number

What is meant when two numbers are directly proportional to each other ?

If one number increases there other number increases by the same factor A = B A = KB Usually give a and b as can work out k

When are shapes similar?

If one shake is congruent to an enlargement of another

When are shapes congruent.?

If their sides are all the same length they have the same corresponding angles

How do you work out when a number is increased by X%?

Multiply the number by 1 + (X/100) (1-(X/100) for decrease)

How is the area of a circle worked out ?

Pir^2

How do you work out the area of a segment

Pir^2 x/360

What information do vectors provide?

The magnitude and direction of a movement from one point to another .

What is a number to the power of 1/n equal to ?

The nth root of that number

How is LCM worked out ?

The prime factors of both numbers multiplied riverbed removing and repeated

What do opposite angles at a vertex add up to ?

They are equal

When are pie charts used?

Used to display proportions of a whole

When are bar charts used ?

When presenting data that can be arranged into groups or categories

How are mine graphs usually written ?

Y= mx +c M= gradient of the line C= y intercept