10705947
Description
Quiz by Tom Woollin, updated more than 1 year ago
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Created by Tom Woollin
about 7 years ago
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Question 1
Question
Please select any/all of the equations that represent the cosine rule.
Answer
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a²=b² -c² + 2ab² cos(A)
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b² =a² + c² - 2ac cos(B)
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cos(C)=a² +b² -c² / 2ab
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a² =b² + c² -2bc cos(A)
Question 2
Question
This is a worked example so you know what to do later on (if you didn't already know)
Q:Find the length of BC.
(Please select the correct working and answer)
Answer
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We want the length a so we use the equation in the form: a² =b² +c² -2bc cos(A), so a² =7² +3² -2*7*3 * cos(35), a² =58 - 42 * cos(35) a² =23.595 (approximately)
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a=4.86
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a=6.42
Question 3
Answer
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50.7°
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50.824°
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33.6°
Question 4
Answer
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6.2cm
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13.1cm
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6.8cm
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