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For all practical purposes, yes. But the earth is not a perfect oblate spheroid, although it is very close. If you want to get very picky, there may be technical differences in their lengths just because of the unevenness of the earth's surface in places. Meridians that cross only or mostly water would arguably be of the shortest possible length. Those crossing mountain ranges or otherwise quite varied terrain would be technically longer.
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Are all meridians of equal length?
No
Why was it necessary to specify a particular meridan when determining the length of a meter?
I don't see the need for that - all meridians (for example, at sea level) should have the same length.
Which lines of longitude and latitude vary in length?
-- All meridians of longitude have the same length ... they all join the north and south poles. -- Each parallel of north latitude has the same length as the parallel at the equal south latitude, but no other one.
Why aren't all parallels equal in length like meridians are?
There's a simple answer: The earth is a sphere and the parallels are, well, parallel to each other. So obviously the ones closer to the poles are shorter than the ones closest to the Ecuator. As for the meridians all meet at one point ehich are the poles, so they are all the same length.
Are the lines of longitude the same distance apart at the equator as they are at the poles?
No. All of the meridians merge in a single point at the poles.
