Final answer:
A degree of longitude at the equator is approximately 111 kilometers (69 miles), which is a true statement, but this distance decreases as one moves towards the poles.
Step-by-step explanation:
The statement that a degree of longitude on the equator is about 111 kilometers (69 miles) is true. As the Earth is divided into 360 degrees of longitude, and the circumference of the Earth at the equator is approximately 40,075 kilometers (24,901 miles), each degree of longitude at the equator represents approximately 111 kilometers (40,075 km / 360 degrees). However, it's important to note that this distance only holds true at the equator, as the meridians of longitude converge towards the poles, making the actual distance between degrees of longitude gradually smaller as one moves away from the equator towards either pole.