All categories

3 years ago

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

Mathematics

1 answer:

Gre4nikov [31]3 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

You might be interested in

The ratio of the height of two similar pyramids is 4:7. The volume of the smaller pyramid is 1,331cm, to the nearest whole numbe

IRISSAK [1]

Answer:

The volume of the larger pyramid is equal to $7,133\ cm^{3}$

Step-by-step explanation:

step 1

Find the scale factor

we know that

If two figures are similar, then the ratio of its corresponding sides is equal to the scale factor

Let

z----> the scale factor

In this problem, the ratio of the height is equal to the scale factor

$z=\frac{4}{7}$

step 2

Find the volume of the larger pyramid

we know that

If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube

Let

z----> the scale factor

x----> volume of the smaller pyramid

y----> volume of the larger pyramid

$z^{3}=\frac{x}{y}$

we have

$z=\frac{4}{7}$

$x=1,331\ cm^{3}$

substitute

$(\frac{4}{7})^{3}=\frac{1,331}{y}\\ \\(\frac{64}{343})=\frac{1,331}{y}\\ \\y=343*1,331/64\\ \\y=7,133\ cm^{3}$

8 0

3 years ago

Use any method to work these out, but do NOT use a calculator.

Artemon [7]

Answer:

A) 216

B) 64.5

Step-by-step explanation:

x 5.40

___________

You can solve it like that, I don't remember what it is called.

4 0

3 years ago

Which equation is not equivalent to the formula d = rt? A. r= t over d B. r= d over t C. t=d over r D. d=tr

taurus [48]

D = rt

d/r = t
d/t = r
d = tr

incorrect one is : r = t/d

4 0

3 years ago

Read 2 more answers

Don’t understand this question will give brainless thing

____ [38]

The answer is 6.33 units.

4 0

3 years ago

Read 2 more answers

Write and solve a proportion to complete the statement. Round to the nearest hundredth if necessary.

wariber [46]

Answer:

Step-by-step explanation:

<h3>Convert kilometer to miles:</h3>

1 km = 0.62 mi

So, to convert 6 km to mi, multiply 6 by 0.62.

6km = 6* 0.62

= 3.72 mi

<h3>Convert liter to gallon:</h3>

1 L = 0.26 gal

To convert 2.5 L to gallon, multiply 2.5 by 0.26.

2.5 L = 2.5 * 0.26

= 0.65 gal

<h3>Convert pound to kilogram:</h3>

1 lb = 0.45 Kg

To convert 90 lb to Kg, multiply 90 by 0.45.

90 lb = 90 *0.45

= 40.5 Kg

3 0

2 years ago