Write the Word or Phrase That Best Completes Each Statement $25 \mathrm {~cm}$

question 39

Short Answer

Write the word or phrase that best completes each statement or answers the question.
Solve the problem.
-Find the area of the shaded portion ( see illustration) of a circle of radius $25 \mathrm {~cm}$ , formed by a central angle of $115 ^ { \circ }$ . Round your answer to the nearest square $\mathrm { cm }$ .


[Hint: Subtract the area of the triangle from the area of the sector of the circle to obtain the area of the shaded portion.]

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Definitions:

Spur Gears

Cylindrical gears with teeth projecting radially and having edges parallel to the axis, used to transmit motion between parallel shafts in machinery.

Pinion

A small gear that engages with a larger gear or rack, often used to convert rotational motion to linear motion or vice versa.

Mechanical Advantage

The factor by which a mechanism multiplies the force put into it, enabling the lifting or moving of heavier loads with less effort.

Pitch Diameters

The effective diameter of a screw thread, halfway between the crests and roots, used in measuring and specifying thread sizes.