PROBLEM #4 Two points of a trigonometric leveling A and B of a certain terrain are each distance 2500m. Angles A and B are measured from a third point C located in between that has an elevation of 300m. The measured vertical angles to A is + 5°30' and to B is +8°30’ from point C. a. Considering the earth's refraction, what is the difference of elevation A and B? b. What is the elevation of point A? c. What is the difference in elevation between B and C?

Q: Zenith ZA aB CA

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Fire Place Construction and Layout

A fireplace is a chamber, made of different materials usually constructed to contain the fire for various applications. A fireplace is often known as a hearth. Fireplaces can be made of bricks, steel, stone, and concrete. Fireplaces serve as room heaters for cold areas and vary in design and heat efficiency.