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Alika [10]
4 years ago
14

Rounded to the nearest whole number, how many 2ft by 2ft squares will fit into circle that has a diameter of 20 feet?

Mathematics
1 answer:
seraphim [82]4 years ago
3 0

Answer:

79

Step-by-step explanation:

The area of a circle is pi*radius^2; the radius of this circle is 10 (20/2=10). Our area is then 100pi or ~314 square feet. A 2x2 square takes up 4 feet. 314/4 is equal to 78.5, or when rounded, 79

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CATHERINE'S MOTHER IS WRAPPING A BOX THAT IS 12 INCHES LONG X 8 INCHES WIDE X 10 INCHES IN HIGH. HOW MANY SQUARE INCHES OF WRAPP
taurus [48]
12 x 8= 96
10 x 8 =80
12 × 10= 120
120+80+96= 296
8 0
3 years ago
The minute hand of a clock is 14 inches long. what distance does its tip move in 27 minutes?​
Delicious77 [7]

Answer:

39.6 inches

Step-by-step explanation:

27/60×2×22/7×14 =9/20 × 88= 39.6 inches

3 0
3 years ago
A widget inspector inspects 12 widgets and finds that exactly 3 are defective.Unfortunately, the widgets then get all mixed up a
WITCHER [35]

Answer:

0.7455

Step-by-step explanation:

First, we note that there are CC_{12|3} = 220 ways of selecting the defective items.

The probability that the inspector will have to test at least 9 widgets would be 1 minus the probability that the inspector will have to test 8 or less widgets.

This is 1 - P(8 or less widgets have to be checked)

1 - \frac{C_{8|3} }{C_{12|3} }

= 1 - 56/220

= 1 - 0.2545

= 0.7455

8 0
3 years ago
Read 2 more answers
Prove that:<br><br>cos20°cos40°cos80°=1/8​
Naya [18.7K]

Answer:

see explanation

Step-by-step explanation:

Using the double angle identity for sine

sin2x = 2sinxcosx

Consider left side

cos20°cos40°cos80°

= \frac{1}{2sin20} (2sin20°cos20°)cos40°cos80°

= \frac{1}{4sin20} (2sin40°cos40°)cos80°

= \frac{1}{4sin20} (sin80°cos80° )

= \frac{1}{8sin20} (2sin80°cos80° )

= \frac{1}{8sin20} . sin160°

= \frac{1}{8sin20} . sin(180 - 20)°

= \frac{1}{8sin20} . sin20°

= \frac{1}{8} = right side , thus proven

7 0
2 years ago
Read 2 more answers
6. Does the set of ordered
Zolol [24]

Answer: this is not a function because the X values are repeating for example we see that 0 is set in the X value side it can’t have 5 and -5 as it’s y at the same time therefor it’s not a function

6 0
2 years ago
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