Question about wording of problem geometry

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The discussion focuses on the clarity of a geometry problem involving points A, B, and C on horizontal ground, with specified distances between them. The user initially struggled with the wording, questioning whether it indicated that the points lie in a horizontal plane. They concluded that using the cosine rule was necessary to find angle ACB, but felt the phrasing led to confusion and assumptions. Another participant clarified that the wording simply means the points are in a horizontal plane, suggesting it was an attempt to simplify the language. Overall, the conversation highlights the importance of precise wording in mathematical problems to avoid misunderstandings.
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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