Need To Know Formulas

Question 1

Area of a rectangle

Answer 1

Length x width

Lxw

Question 2

Area of a parallelogram

Answer 2

Base x height

Bxh

Question 3

Area of a triangle

Answer 3

0. 5(basexheight)

0. 5(bxh)

Question 4

Area of a trapezium

Answer 4

0.5(a+b)h

Question 5

Volume of a cuboid

Answer 5

Length x width x height

L x w x h

Question 6

Area of a prism

Answer 6

Area of cross section x length

Question 7

Area of cylinder

Answer 7

πr^2 x height

Question 8

Area of pyramid

Answer 8

1/3 x area of base x height

Question 9

Circumference of a circle

Answer 9

π x diameter

OR

2πr

Question 10

Area of a circle

Answer 10

πr^2

Question 11

Speed equation

Answer 11

Speed = Distance ÷ time

Question 12

Density equation

Answer 12

Density = mass ÷ volume

Question 13

Pressure equation

Answer 13

Pressure = force ÷ area

Question 14

Pythagoras Theorem

Answer 14

a^2 = b^2 + c^2

Question 15

Sin (x)

Answer 15

Opposite / hypotenuse

Question 16

Cos(x)

Answer 16

Adjacent / hypotenuse

Question 17

Tan (x)

Answer 17

Opposite/adjacent

Question 18

Sine rule

Answer 18

a/sinA = b/sinB = c/sinC (for side)

SinA/a = sinB/b = sinC/c (for angle)

Question 19

Cosine rule

Answer 19

a^2 = b^2+c^2- 2bc(cosA)

CosA = (b^2+c^2-a^2) ÷ 2bc

Question 20

Trig area of triangle

Answer 20

0.5ab x sinC

Question 21

Quadratic formula

Answer 21

(-b+ or - √(b^2-4ac)) / 2a