A great circle crosses the equator at 17°W....

Question 1 of 31048fy_heal_CREATE_q204_2022

A great circle crosses the equator at 17°W. It will also cross the equator at what other longitude?

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Question 1 of 31048

Q

A great circle crosses the equator at 17°W. It will also cross the equator at what other longitude?

🔍 Key Concepts

• Great circle geometry on a sphere • Relationship between antipodal points (points directly opposite each other on the globe) • How longitude values are measured east and west from the Prime Meridian (0°)

💭 Think About

• If a great circle crosses the equator at one longitude, where must it cross again to make a full circle around the Earth? • How many degrees of longitude are there around the Earth, and what does that imply about the longitude of the point directly opposite 17°W on the equator? • When you add or subtract 180° from a west longitude, do you stay west, or might you change to east longitude depending on the total?

✅ Before You Answer

• Remember a great circle is the largest possible circle on a sphere, so its two equator crossings are exactly opposite each other on the globe. • Check that your second longitude is 180° away from 17°W (numerically) and correctly labeled E or W. • Verify that longitudes are always expressed between 0° and 180° east or west, so adjust your sign/direction to fit that convention.