Answer:
- length 100 ft
- height 30 ft
Step-by-step explanation:
The center is 40 ft from the focus, so the wall is 40+10 = 50 ft from the center. From wall to wall must be 2×50 ft = 100 ft.
The length is 100 ft.
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Assuming the gallery has an elliptical vertical cross section, the distance from the focus to the center ceiling is the same as half the length of the gallery, so we can use the Pythagorean theorem to find the height:
50² = 40² + h²
h = √(2500 -1600) = √900 = 30
The height of the ceiling at the center is 30 feet.
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<em>Comment on the geometry</em>
We expect the gallery to have an elliptical floor plan, rather than an elliptical vertical cross section. In the latter case, the focus would have to be above the floor for it to work, so the ceiling at center would have to be higher than 30 ft. by the distance that the focus is above the floor.
Answer:
D. Hyperbola
Step-by-step explanation:
symmetrical open curve formed by the intersection of a circular cone with a plane at a smaller angle with its axis than the side of the cone.
Answer:
Step-by-step explanation:
The Pythagorean theorem tells us that , where a and b are the legs of a right triangle. If the length of each leg is x, we know by applying the theorem that , so . Applying the square root on both sides we get
Answer: yes or no who knows
Step-by-step explanation:
When you divide -8/2=-4 and 2/2=1
-4<1
when you divide by a negative number your sign changes
4>-1