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Fixes for the hyperbola intuition exercise#161553
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wrwrwr wants to merge 5 commits intoKhan:masterfrom
Open
Fixes for the hyperbola intuition exercise#161553wrwrwr wants to merge 5 commits intoKhan:masterfrom
wrwrwr wants to merge 5 commits intoKhan:masterfrom
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The semi-major axis (a) is the distance from the center to a vertex (horizontal distance in this case), and the semi-minor axis (b) is the distance from a vertex to an asymptote along a tangent (vertical in this case).
Wiki calls the center (h, k). Let's stick to this.
Also reorder x_1 and y_1 to match answer fields in the east-west case.
Compare with the final hint. This is sometimes written with a -1 instead of a 1.
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One more thing that could be improved is the 7th hint -- it shows how to calculate the semi-minor axis, but doesn't say what it is. |
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A few fixes:
plus some minor readability improvements.
Some references:
One possibility for testing is to copy the equation from the final hint to Alpha. Clicking "Properties" gives foci, center etc.