Answer:
A
Step-by-step explanation:
Hyperbolic geometry is defined as a non-Euclidean geometry.
(invalidating the fifth postulate of Euclid's five fundamental postulates)
Choice B and D can be eliminated because this has nothing to do with perpendicular lines.
Choice C should be eliminated as well since that's exactly the fifth postulate of Euclid's five fundamental postulates
We are left with A by the process of elimination
Answer:
Correct choice is B
Step-by-step explanation:
In step 4 were proved that 
By definition, similar triangles have proportional lengths of corresponding sides. To the side AB corresponds side ED, to the side AC corresponds side DC and to the side BC corresponds side EC. Thus,

Answer:

Step-by-step explanation:








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Answer:
<h2>3 in</h2>
Step-by-step explanation:
The formula of a volume of a cube:

a - length of an edge
We have V = 27 in³. Substitute:
![a^3=27\to a=\sqrt[3]{27}\\\\a=3\ in](https://tex.z-dn.net/?f=a%5E3%3D27%5Cto%20a%3D%5Csqrt%5B3%5D%7B27%7D%5C%5C%5C%5Ca%3D3%5C%20in)