Trigonometric Ratios And Applications
Akopọ
SOHCAHTOA is powerful, but it only works inside a right-angled triangle. Surveyors, sailors and pilots rarely get one handed to them: they measure whatever angles and distances are convenient and need tools that work on any triangle at all, right-angled or not.
This topic extends trigonometry beyond 90 degrees, then builds the sine rule, the cosine rule and the area formula \(\frac{1}{2}ab\sin C\) for solving any triangle. It finishes with the three classic application types Edexcel tests hardest: angles of elevation and depression, bearings, and problems that step into three dimensions.
Awọn Afojusun
- Use sine, cosine and tangent of angles up to 180 degrees
- Solve problems in two and three dimensions by calculation and by drawing, using the sine rule, cosine rule and the formula area = 1/2 ab sin C
- Understand and use angles of elevation and depression
- Understand and use bearings measured clockwise from north
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- What is the value of sin(150 degrees)? A) -0.5 B) 0.5 C) 0.866 D) -0.866 Answer: B
- Which rule should be used when three sides of a triangle are known and an angle is required? A) Sine rule B) Cosine rule C) SOHCAHTOA D) Area = 1/2 ab sin C Answer: B
- The angle of elevation from a boat to a lighthouse is 20 degrees. What is the angle of depression from the lighthouse to the boat? A) 20 degrees B) 70 degrees C) 90 degrees D) 160 degrees Answer: A
- A bearing of 128 degrees has a back bearing of: A) 052 degrees B) 232 degrees C) 308 degrees D) 128 degrees Answer: C
- In a right-angled triangle, when angle A = 90 degrees, the cosine rule a^2 = b^2 + c^2 - 2bc cos A simplifies to: A) a^2 = b^2 - c^2 B) a^2 = b^2 + c^2 C) a^2 = 2bc D) a^2 = b^2 + c^2 - 2bc Answer: B
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Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Right Triangle Trigonometry
Use right triangles to evaluate trigonometric functions.
"Algebra and Trigonometry: Right Triangle Trigonometry" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/algebra-and-trigonometry/pages/7-2-right-triangle-trigonometry. Access for free at https://openstax.org/books/algebra-and-trigonometry/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Unit Circle
Find function values for the sine and cosine of 30° or ( π 6 ) , 45° or ( π 4 ) , 30° or ( π 6 ) , 45° or ( π 4 ) , and 60 ∘ or ( π 3 ) . 60 ∘ or ( π 3 ) .
"Algebra and Trigonometry: Unit Circle" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/algebra-and-trigonometry/pages/7-3-unit-circle. Access for free at https://openstax.org/books/algebra-and-trigonometry/pages/1-introduction
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