ACT Math 5.3 Trigonometry
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ACT Math: Trigonometry Drill 5, Problem 3. What is the length of side x?
|Foreign Language||Arabic Subtitled|
|Geometry||Right Triangles and Trigonometry|
|Product Type||ACT Math|
|Trigonometry||Solving right triangles|
Trigonometric relations in right triangles
The cosine of an angle is equal to the adjacent side over the hypotenuse.
If the adjacent side is 3 and the hypotenuse is 7, we can use the Pythagorean theorem to
solve for the missing leg, x.
So we can just plug our numbers into this formula,
Three squared plus x squared equals seven squared.
9 plus x squared equals 49.
x squared equals 40.
x equals the square root of 40.
The square root of 40 is equal to 2 root 10, and there you have it...
...option C. That's the way to go.