Triangles

Question 1

What is the quadratic formulas

Answer 1

X = -b+- square root of b^2 -4ac
_______________________________
2a

Question 2

How do you work out angle of right angles triangle

Answer 2

Sohcahtoa.
Sin x = opp/hyp x = sin inverse ans
Cos x = adj/hyp x = cos inverse ans
Tan x = opp/adj x = tan inverse anse

Question 3

How do you work out side of right angle triangle

Answer 3

Pythagoras

A^2 + B^2 = C^2

Question 4

How do work out area of a pyramid

Answer 4

1/3 * base area * verticale height

Question 5

What is sine rule and which one should be used to find the unknown

Answer 5

a/sinA = b/sinB = c/sinC
Or
SinA/a = SinB/b = SinC/c
Capitals are the angles lowers are the sides
Use the formula with the unknown on the top of the fraction

Question 6

What are the cosine formulas

Answer 6

a^2 = b^2 + c^2 -2bc cosA for sides
Or
cos A = b^2+c^2-a^2
              \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
                          2bc