contour line
The angle of the light passed the edge of the object is greater, creating a larger shadow.
Picture the center of a circle. The distance from it to the edge of the circle is the radius. The fixed distance from the center to the edge of any part of the circle is radial movement. So radial movement is the circular distance an object can move from a fixed point.
Shadows are formed because when light hits an object, it does not pass through it. Light going around the edge of the object fills in the light void a bit, but it does not make up for the missing light.
Surface Tension
Does the universe have an edge? Does the Earth have an edge?
contour line
Its perimeter
outline
outline
A nickel has a smooth edge. No ridges.
The ridges around the edge of a dime is called reeding or milling. There are 118 ridges.
Zero.Dimes have ridges. Quarters have ridges. Pennies and Nickels don't.
According to the US Mint, a dime has 118 reeds/ridges.
A face is the flat surface of an object (2 or 3 dimensional). An edge is when two sides (faces) meet on an object. A vertex is the corner of an object, where an angle exists between two or more lines.
Coin Edge.
An American quarter has 119 ridges. Believe it or not, a dime has 118 ridges- that's only one more ridge!
A margain could be drawn on any edge of a paraghraph.