Which of the following sets of side lengths could represent the side lengths of a -- triangle?
Table of contents
- 0. Review of College Algebra4h 43m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
- OLD 1. Angles and the Trigonometric Functions Coming soon
- OLD 2. Trigonometric Functions graphs, Inverse Trigonometric Functions Coming soon
- OLD 3. Trigonometric Identities and Equations Coming soon
- OLD 4. Laws of Sines, Cosines and Vectors Coming soon
- OLD 5. Complex Numbers, Polar Coordinates and Parametric Equations Coming soon
- NEW (not used) 7. Laws of Sines, Cosines and Vectors Coming soon
- NEW (not used) 8. Vectors Coming soon
- NEW(not used) 9. Polar equations Coming soon
- NEW (not used) 11. Graphing Complex Numbers Coming soon
2. Trigonometric Functions on Right Triangles
Special Right Triangles
Multiple Choice
Given the triangle below, determine the missing side(s) without using the Pythagorean theorem (make sure your answer is fully simplified).

A
x=81
B
x=92
C
x=29
D
x=162
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Verified step by step guidance1
Identify the type of triangle: The given triangle is a right triangle with one angle measuring 45 degrees. This indicates that it is a 45-45-90 triangle, which is an isosceles right triangle.
Recall the properties of a 45-45-90 triangle: In a 45-45-90 triangle, the legs are congruent, and the hypotenuse is \( \sqrt{2} \) times the length of each leg.
Given that both legs of the triangle are 9 units, use the property of 45-45-90 triangles to find the hypotenuse. The formula for the hypotenuse \( x \) is \( x = 9 \times \sqrt{2} \).
Simplify the expression for the hypotenuse: \( x = 9 \sqrt{2} \). This is the length of the hypotenuse in its simplest form.
Verify the solution: Check that the calculated hypotenuse \( x = 9 \sqrt{2} \) is consistent with the properties of a 45-45-90 triangle, ensuring that the solution is correct.
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