Question about wording of problem geometry

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SUMMARY

The discussion centers on the interpretation of a geometry problem involving points A, B, and C on a horizontal plane, with specified distances AB=19m, BC=16m, and CA=21m. The user initially found the wording confusing, particularly regarding the phrase "lie on Horizontal ground," which led to uncertainty about the problem's context. Ultimately, the user clarified that the phrase simply indicates that the points are in a horizontal plane, and the cosine rule was correctly applied to calculate angle ACB.

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Taylor_1989
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So I am not asking for any help, on the question, I figured it out and got the right ans. My problem is with the wording.

Question: The points A,B and C lie on Horizontal ground and are such AB=19m, BC=16m and CA=21m

a) calculate the size of angle ACB

The part I have underlined is the bit that through, a bit confusing mainly because I can't really picture it, dose it mean that is lie in the horizontal plane, or something like that. The only way I was able to workout that, I had to use the cosine rule was because it ask me to calculate the size of angle ACB. So basically I made a assumption, which is not good, when trying to figure out maths.

Could someone help me out with the wording of the question, to me its slightly misleading.

Thanks in advance; happy new year.
 
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Yes, it just means they're in a horizontal plane. Seems like an attempt to use less technical language.
 

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