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The equator and the Greenwich meridian.

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Q: What 2 lines are the base lines for measurements of earths surface?
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How many lines does a cone have?

Infinitely many. There are infinitely many lines from the apex to the base. Every point on each of these lines is on the surface of the cone.


How do you check a parallelism using a dial indicator?

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What is a total area of a pyramid that has a square base with sides 8 and a slant height of 5?

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How do you find the surface area when you have the base and side?

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A square and a rectangle have perpendicular and parallel lines. The two side lines extending upwards from the base line are perpendicular to the base line. The line extending from each of the side lines across the top is perpendicular to the side lines. The top line is also parallel to the base line, and the side lines are also parallel to each other.