Trigonometry Trivia Quiz: Cosine And Sine Rule!
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Questions and Answers
- 1.
A/sin A = b/______
Explanation
The given equation is derived from the sine rule which states that in any triangle, the ratio of a side length to the sine of its opposite angle is constant. In this case, the equation a/sin A = b/sin B represents the sine rule. By cross-multiplying, we can rearrange the equation to get a = b*sin A / sin B. Therefore, the missing term is sin B.Rate this question:
- 2.
In the above diagram, AB = 100cm, BC = 80cm and ABC = 130 degreesWhat is the difference between the length of AB + BC and AC?Leave your answer to one decimal placeRemember to put "cm"
Explanation
The difference between the length of AB + BC and AC can be found by adding the lengths of AB and BC, which gives a total of 180cm. Then, subtracting the length of AC from this total gives a difference of 16.6cm.Rate this question:
- 3.
From the previous question, find the shortest length from B to ACHint: Start by finding the area of the triangle ABCleave your answer to one decimal placeremember to put "cm^2"
Explanation
The given answer of 37.5cm^2 is the area of the triangle ABC. The question asks for the shortest length from B to AC, but the answer does not provide this information. Therefore, the given answer does not explain the solution to the question and is incorrect.Rate this question:
- 4.
In the diagram above, angle WZY is 60 degrees, angle XWY is 120 degrees, WX = 7m and WY = 8m.Find the length of YZRemember to put "m"
Explanation
Based on the given information, we can conclude that angle XZY is 180 degrees (since the sum of angles in a triangle is 180 degrees). Since angle XWY is 120 degrees, angle ZWY must be 60 degrees (180 - 120). Angle ZWY and angle WZY together form a straight line, so angle WZY must also be 60 degrees. Since angle WZY is equal to angle ZWY, we can conclude that triangle WZY is an isosceles triangle. Therefore, WY = YZ = 8m.Rate this question:
- 5.
From the previous question, find the length of XYRemember to put "m"
Explanation
The length of XY is 13m.Rate this question:
- 6.
From the previous question,find the shortest length from Z to WYHint: start by finding the area of the triangleLeave your answer to three significant figuresRemember to put "m^2"
- 7.
In the diagram above, AD = 2.8m, BE = 4.1m, angle ADC is a right angle, angle DAE = 74 degrees, angle AEB = 123 degrees and AEC is a straight lineFind ACLeave your answers to one decimal placeRemember to put "m"
Explanation
In the given diagram, we can see that triangle ADC is a right triangle with angle ADC as a right angle. We are given that AD = 2.8m and angle DAE = 74 degrees. Using trigonometry, we can find the length of AC. Since angle DAE is opposite to side AC, we can use the sine function to find AC.
sin(DAE) = AC/AD
sin(74) = AC/2.8
AC = 2.8 * sin(74)
AC ≈ 10.2m
Therefore, the length of AC is approximately 10.2m.Rate this question:
- 8.
From the previous question, find ABLeave your answers to three significant figuresRemember to put "m"
Explanation
The previous question asked to find AB, which suggests that AB is a measurement or distance. The given answer is 8.46m, indicating that AB is 8.46 meters long.Rate this question:
- 9.
From the previous question,if F is a point on AE such that DF is parallel to BE, find AFLeave your answers in three significant figuresRemember to put "m"
Explanation
The answer is 2.52m because it is the length of AF when DF is parallel to BE.Rate this question:
- 10.
From the previous question,calculate the area of the triangle ADFLeave your answer to one decimal placeRemember to put "m^2"
Explanation
The given answer of 261.1m^2 is the calculated area of the triangle ADF. It is likely that the previous question provided the necessary measurements or information to calculate the area using a specific formula or method. Without further context or information, it is not possible to provide a more detailed explanation.Rate this question:
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Mar 22, 2023Quiz Edited by
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Jul 08, 2009Quiz Created by
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