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Trigonometry, teta must be acute= 1 possible ans, teta can have 2 possible…
Trigonometry
Formula's
:star: Area of :small_red_triangle: = 1/2ab sin c
Sine rule
: a/sinA = b/sinB (to find a side) :star:
Sine rule
: sinA/a = sinB/b (to find <) :star:
:star:
Cosine rule
: a^= b^ + c^ -2bc cos a :arrow_left: last resort!
sin(180*-teta) = sin(teta)
cos(180*-teta)= -cos(teta)
tan(180*-teta)= -tan(teta)
:star:
Pythagoras Theorem
Real-life Qns
Finding a side of a :small_red_triangle:
Area of :small_red_triangle:
area and the cost of a unit/area
Basics (TOA,CAH,SOH)
sine, cosine, tangent
sin (180*- teta)= sin(teta)
sin is +ve
sin(180*- teta)= both positive & negative
sin= O/H
tangent
tan=O/A
cos (180*- teta)= -cos(teta)
cos= acute< :arrow_right: positive
cos= obtuse< :arrow_right: negative
cos= A/H
Acute < , Obtuse< , Right<
teta must be acute= 1 possible ans
teta can have 2 possible ans.