Maths

Question 1

3 formlas for triangle

Answer 1

(Need base and height) bh/2 or 1/2 x bh,
(Need all 3 sides) A = s(s-a)(s-b)(s-c) square root that and s is = a+b+c/2,
(Need 2 sides and angle) 1/2 ab Sin C

Question 2

Area of parallelogram formula

Answer 2

A = bxh

Question 3

Rhombus Area formula

Answer 3

A = D1xD2/2

Question 4

Area of kite formal

Answer 4

A = D1xD2/2

Question 5

Trapezium area formula

Answer 5

a+b/2 x h

Question 6

Area and Circumference of a circle

Answer 6

A = pie x r^2, C = 2 x pie x r

Question 7

Pythagoras Theorem

Answer 7

a^2+b^2=c^2

Question 8

Sine, Cos, Tan

Answer 8

Sin = Opp/Hyp, Cos = Adj/Hyp, Tan = Opp/Adj

Question 9

Step of finding the bearing of location

Answer 9

Measure the angle starting from North
Measure the angle clockwise from North
Always use 3 digits when writing answer (e.g 077 degrees)

Question 10

Simple Interest Formula

Answer 10

I = PRT

Question 11

Compound Interest Formula

Answer 11

A = P (1+r/n)^nt

Question 12

Area of Triangular prism

Answer 12

V = LxWxh,/2, LxW(of base/ the triangle), h(height is not the triangle height, it’s the prism from the triangular base)

Question 13

Surface Area of Pyramid

Answer 13

SA= A+1/2 ps
A= Area of base
p= perimeter of base
s= slant height

Question 14

Volume of Triangular Pyramid (not prism)

Answer 14

V = 1/3 Bh
B= Base Area
h= height

Question 15

Volume of Square Pyramid (not prism)

Answer 15

V= 1/3b x b^ x h
b^2 because is a SQAURE pyramid

Question 16

Surface Area and Volume of Cube

Answer 16

SA = L^2 x 6
V=L^3

Question 17

Surface Area and Volume of a Sphere

Answer 17

SA = 4 x pie x r^2
V = 4/3 pie r^3 (make sure to put ^3)

Question 18

Volume of Cylinder

Answer 18

V = Ah, (pie x r^2 x h)

A = Area of base of cylinder(the circle), which is pie x r^2
h= height

Question 19

Formula to find density

Answer 19

p= m/v

N.B Not actually a p, I don’t have the sign for density that’s why.

p= density
m= mass
v= volume

Question 20

Directly proportional, indirectly or inversely proportional

Answer 20

Directly proportional - x = ky x = the sign times y

Inversely proportional - x = k/x x = the sign 1/y

Remember, if the question asked you to square or cube something, then do so.
E.g . x = k/x^2