The Right Triangle
Nicolaas Lems
Contents
What is a Right Triangle?
Cosine
Sine
Tangent
References State Core
Title Page
Sine
Sine(a)=Opposite/Hypotenuse
Hypotenuse
Opposite
a
Adjacent
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Problem using Sine
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Cosine
Cosine(a)=Adjacent/Hypotenuse
Hypotenuse
Opposite
a
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Adjacent
Problem using Cosine
contents
Tangent
Tangent(a)=Opposite/Adjacent
Hypotenuse
Opposite
a
Adjacent
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Problem using Tangent
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What is a Right Triangle?
A right triangle is a triangle with
one of it’s three angles
measuring to be 90º
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More on the right triangle
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Find the Value of X using the
Sine
10
X
need help
32°
previous
answer
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Find the value of X using the
Cosine
X
need help
70º
12.5
previous
answer
contents
Find the value of X using the
Tangent
20
need help
50
°
previous
X
answer
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Answer
Sin(32º)=X/10
10
X
X=sin (32º)*10
X=5.3
32°
Click to see answer
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Answer
Cos(70º)=12.5/X
X
X= 12.5/Cos(70º)
X=36.5
70º
12.5
Click to see answer
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Answer
Tan(50º)=20/X
20
X=20/ Tan(50º)
50
°
X=23.8
X
Click to see answer
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References
Math World
http://mathworld.wolfram.com/RightTriangle.html
Webmath.com
http://www.webmath.com/rtri.html
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State Core
Standard 2
Students will represent and analyze mathematical
situations and properties using patterns, relations,
functions, and algebraic symbols.
Objective 2.1
Use patterns, relations, and functions to represent
mathematical situations.
Identify trigonometric relationships (sine, cosine, and
tangent) using right triangles, expressing the relationships
as fractions or decimals.
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