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Setler79 [48]
3 years ago
9

Miyuki can type 135 words in 3 minutes.How many words can she expect to type in 8 minutes?

Mathematics
2 answers:
Alekssandra [29.7K]3 years ago
5 0
135 / 3 is 45 and 45 x 8 is 360 so she can type 360 words in 8 minutes.
torisob [31]3 years ago
5 0
Miyuki can type 360 words in 8 minutes because, 135 divided by 3 is 45 (that's to get how many words Miyuki can type in a minute.) and 45 times 8 is 360.<span />
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A circle has a circumference of 28π centimeters. In terms of π, what is the area of the circle to the nearest square centimeter?
Vadim26 [7]

Hi there!

The formula to find the are of a circle is :

a = \pir²

The formula to find the circumference of a circle is :

c = 2\pir


In order to use the area formula, you need to figure out what the radius (r) is.

If we solve for "r" in the circumference equation, we have :

r = c ÷ (2\pi)


Now we use this to replace "r" in the area formula :

a = \pi ( c ÷ (2\pi))²


When we simplify this we get :

a = c² ÷ 4\pi


Now you can put your value of "c" into this equation and find "a".

*Remember, \pi is about 3.1416.


Solving for "a" :

a = c² ÷ 4\pi

a = 28² ÷ 4\pi


28² = 28 × 28 = 784


a = 784 ÷ 4\pi


4\pi = 4 × \pi = 12.56637061435917


a = 784 ÷ 12.56637061435917

a = 62.38873769202297cm²


You need to round to the nearest square centimeter, which means that you need to round to the nearest whole number :

a = 62cm²


There you go! I really hope this helped, if there's anything just let me know! :)

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