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malfutka [58]
2 years ago
11

70. Area A car's rear windshield wiper rotates 125º. The

Mathematics
1 answer:
Gre4nikov [31]2 years ago
5 0

Answer:

175 square inches

Step-by-step explanation:

Area wiped by the wiper blade = Area covered by the whole wiper mechanism - Area that is not being wiped.

Where area of a sector of 125°....Area = 1/2.r^2.theta....but with theta in radians

Area covered of the whole wiper mechanism;

= 1/2 × 25^2 × (25pi/36)...in which (25pi/36) is 125° in radians..

=217.014pi

Area that is not being wiped;

= 1/2 × (25 - 14)^2 × (25pi/36)

= 42.014pi

Area wiped by the wiper blade

217.014 - 42.014

Area = 175 square inches

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