Home › ZIMSEC O-Level › Mathematics › Trigonometry › Which rule fits a triangle when two angles and o…
Which rule fits a triangle when two angles and one side are known?
AThe area rule
BThe sine rule
CThe cosine rule
DThe chord rule
Answer & Solution
Correct answer: B. The sine rule
1. The sine, cosine and area rules all work in triangles that have no right angle.
2. The sine rule is chosen when two angles and a side are given.
3. It is also chosen when two sides and an angle that is not between them are given.
4. The cosine rule is for two sides with the angle between them, or for all three sides.
5. The area rule is used to find area, not a missing side or angle.
_Source: Siyavula Mathematics Grade 11 (Everything Maths, CC BY 4.0), Chapter 6: Trigonometry_
Related questions
When solving a trigonometric equation, what is the CAST diagram used for?Why does a trigonometric equation have infinitely many solutions unless the domain is restTwo sides of a triangle and the angle opposite the shorter of them are given. What does thTwo sides of a triangle are 10 cm and 8 cm long and the sine of the angle between them is What is a mathematical statement that equates one quantity with another called?Which result is used alongside the three trigonometric ratios to solve two-dimensional proAn observer stands on top of a cliff and looks down at a boat below. What is the angle betA sailor in a boat looks up at the top of a cliff. What is the angle between the line of s