Sine And Cosine Formulae
Gbogbo ọrọ náà
Not every triangle contains a right angle, so SOHCAHTOA alone is not enough. The sine rule and the cosine rule let you find missing sides and angles in any triangle, making them essential tools across the entire 4PM1 specification and beyond.
You will learn when to reach for each rule, handle the ambiguous case that the sine rule can produce, and calculate areas without needing a perpendicular height. Every worked example follows the method examiners reward: identify the known quantities, choose the right formula, substitute, and solve with clear working.
Ebumnobi
- Use the sine rule and cosine rule to solve problems in triangles
- Use the formula (1/2)*ab*sin(C) for the area of a triangle
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Sine And Cosine Formulae. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- When should you use the cosine rule instead of the sine rule? A) When you know two angles and one side B) When you know two sides and the included angle C) When you know one side and its opposite angle D) When you know all three angles Answer: B
- In a triangle with a = 5, b = 7 and C = 60 degrees, what is a squared + b squared - 2ab cos C? A) 39 B) 74 C) 25 D) 49 Answer: A
- The ambiguous case of the sine rule can arise when you are given: A) Three sides B) Two angles and a side C) Two sides and a non-included angle D) Two sides and the included angle Answer: C
- What is the area of a triangle with sides 6 cm and 10 cm and an included angle of 30 degrees? A) 15 cm squared B) 30 cm squared C) 60 cm squared D) 25.98 cm squared Answer: A
- In a triangle ABC, if a/sin A = 12, what is b when B = 45 degrees? A) 12 B) 6 sqrt(2) C) 6 D) 12 sqrt(2) Answer: B
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Non-right Triangles: Law of Sines
Use the Law of Sines to solve oblique triangles.
"Algebra and Trigonometry: Non-right Triangles: Law of Sines" 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/10-1-non-right-triangles-law-of-sines. Access for free at https://openstax.org/books/algebra-and-trigonometry/pages/1-introduction
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Akụkụ akwụkwọ
Non-right Triangles: Law of Cosines
Use the Law of Cosines to solve oblique triangles.
"Algebra and Trigonometry: Non-right Triangles: Law of Cosines" 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/10-2-non-right-triangles-law-of-cosines. Access for free at https://openstax.org/books/algebra-and-trigonometry/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
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