Solving Right Triangles: Pythagorean Theorem, Trigonometry
Geometry · Flashcards
GEOMETRY · FLASHCARDS
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QUESTION
What is
cos
(
60
∘
)
\cos(60^\circ)
cos
(
6
0
∘
)
written as a sine of a complementary angle?
QUESTION
What does it mean for angles
α
\alpha
α
and
β
\beta
β
to be complementary in degrees?
QUESTION
What is the complementary-angle identity that relates
sin
(
θ
)
\sin(\theta)
sin
(
θ
)
to a cosine expression?
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ANSWER
sin
(
θ
)
=
cos
(
90
∘
−
θ
)
\sin(\theta)=\cos(90^\circ-\theta)
sin
(
θ
)
=
cos
(
9
0
∘
−
θ
)
. Sine of an angle equals cosine of its complement.
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