In a right triangle, the non-right angles are complementary, meaning their measures add up to 90°, with one angle measure denoted as x.
1. If in a right triangle, the measure of an angle x satisfies sin x = 1/3, which of the following expressions involving cosine is equal to 1/3?
2. What fundamental property characterizes the sine of angle x in a right triangle?
3. Which of the following best describes the meaning of the expression cos(90° - x) in relation to sin x?
Right triangle — angle measure?
Non-right angles sum to 90°.
Sine of x — ratio?
Opposite over hypotenuse.
Expressions equal to 1/3?
cos(90° - x) equals 1/3.
Cosine of x — ratio?
Adjacent over hypotenuse.
Shifted angles — cosine?
Cos(90° - x) = sin x.
Complementary angles — sum?
Sum to 90° in right triangles.
It covers the core concepts of Understanding Right Triangle and Trigonometric Relationships, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.
Read the full study guide →The practice quiz has 5 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.
Take the quiz (5 questions) →There are 10 flashcards on Understanding Right Triangle and Trigonometric Relationships, with a question on the front and the answer on the back. Try to recall each answer before you flip, and let spaced repetition bring back the ones you miss.
See all 10 flashcards →Upload a PDF or paste your notes. Revizly writes a study guide, a practice quiz and flashcards in about a minute.