Q:
# How many edges does a cylinder have?

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### Quick Answer

A cylinder technically has two curved edges, but in mathematics, an edge is defined as a straight line. Therefore, a cylinder actually has no edges, no vertices and two faces.

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Cylinder originates from the Greek word "kulindros," meaning "roller" or "tumbler." It is a basic geometric shape, defined by its axis and enclosed surface area. In differential geometry, a cylinder's properties are more broad. When its cross section is an ellipse, parabola or hyperbola, a cylinder is called an elliptic, parabolic or hyperbolic cylinder, respectively.

Everyday uses of a cylinder are containers, the piston chamber in engines and bullet chambers.

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Q:
## How do you find the equation of a secant line?

A:A secant line of a curve is a straight line connecting two points on the curve. The equation for a line is given by the formula y = mx + b, where m equals the slope of the line, and b equals the y intercept, or the point where the line crosses the y axis. Find the equation by first finding the slope, then plugging values for x and y into the formula and solving for b.

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Q:
## What is the directrix of a parabola?

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Full Answer >**The directrix of a parabola refers to a straight line that is drawn perpendicular to the axis of symmetry of a parabola.**This line does not touch the parabola at any point. In addition, it is a horizontal line if the axis is vertical.Filed Under: -
Q:
## What is a horizontal line?

A:A horizontal line is a straight line that goes from left to right, which can be open or closed in form. On a coordinate plane, a horizontal line runs parallel to the x-axis.

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Q:
## What is the radiius of a circle?

A:

Full Answer >**The radius of a circle is the distance from the center of a circle to any point on its edge.**The word derives from the Latin word "radius," meaning a staff, a spoke or a stake of a wheel.Filed Under: