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Longitude is measured by imaginary lines that run around the Earth vertically (up and down) and meet at the North and South Poles. These lines are known as meridians. Each meridian measures one arcdegree of longitude. The distance around the Earth measures 360 degrees
The instruction formats that use arrows, boxes, and a small amount of text to express actions, events , or decisions is :
Flow chart
Flow chart usually used to described the movement in a complex system or activities
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