Solve the Problem $n$ Sides Has $\frac { 1 } { 2 } n ( n - 3 )$

question 56

Multiple Choice

Solve the problem.
-If a polygon, of $n$ sides has $\frac { 1 } { 2 } n ( n - 3 )$ diagonals, how many sides will a polygon with 189 diagonals have?

• A) 22 sides
• B) 21 sides
• C) 20 sides
• D) 23 sides

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Definitions:

Output Air Pressure

The pressure of air delivered from a compressor or a pressurized system, useful in various mechanical and pneumatic applications.

Drum Servo Brakes

A type of brake system that uses a servo mechanism to amplify the force applied by the driver, improving braking efficiency especially in heavy vehicles.

Self-energizing

Referring to a mechanism that uses the motion or force of its operation to increase its effectiveness without needing an external power source.

Secondary Shoes

Components of a drum brake system positioned to assist in braking, usually having less wear than primary shoes.