An automobile windshield wiper 7 inches long rotates through an angle of 60 ∘ . If the rubber part of the blade covers only the last 6 inches of the wiper, find the area of the windshield cleaned by the windshield wiper.

25.13 square inch

Step-by-step explanation:

The automobile windshield wiper 7 inches long rotates through an angle of 60 degrees.

Note that the rubber part covers only the last 6 inches of the wiper.

To find the area of the windshield cleaned by the wiper,

We find the area of the annulus shaded in grey in the diagram.

Area of a Sector=

For the larger sector, Radius, R=7cm

For the smaller Sector, radius r=1cm

Area cleaned by the wiper

The area cleaned by the wiper is 25.13 square inch.

the first question mark is 6 and the second question mark is 26 (the square root)

step-by-step explanation:

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,