If a windshield wiper covers an area of approximately 160 square inches when it rotates at an angle of 84°, find the length of the wiper to the nearest tenth of an inch.

General Idea:

We can use the below formula to find the area of sector (A), when angle of sector and radius is given:

Applying the concept:

We need to substitute 84 for and 160 for A in the above formula:

Conclusion:

If a windshield wiper covers an area of approximately 160 square inches when it rotates at an angle of 84°, the length of the wiper to the nearest tenth of an inch is 14.8

answer: (1,3) and (-2,0) i think.