The End of a 30 Mm-Diameter Round Rod Is Milled $225 \mathrm {~mm} ^ { 2 }$

question 45

Multiple Choice

The end of a 30 mm-diameter round rod is milled as shown in the given figure. Find the area of the square.

• A) \(225 \mathrm {~mm} ^ { 2 }\)
• B) \(450 \mathrm {~mm} ^ { 2 }\)
• C) \(900 \mathrm {~mm} ^ { 2 }\)
• D) Insufficient information.

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Definitions:

Preparatory Reaction

A phase in cellular respiration occurring in the mitochondria where pyruvate from glycolysis is converted into acetyl-CoA, preparing it for the citric acid cycle.

Oxygen

A chemical element with symbol O and atomic number 8, essential for respiration in many living organisms and for combustion.

Fermentation

A metabolic process that converts sugar to acids, gases, or alcohol in the absence of oxygen.

Alcohol

An organic compound characterized by one or more hydroxyl (-OH) groups attached to a carbon atom, commonly used in beverages, medicine, and as a solvent.