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mash [69]
2 years ago
5

True or false? If a and b are complementary, then a equals 45 degrees.

Mathematics
1 answer:
laiz [17]2 years ago
7 0

Answer:

true

Step-by-step explanation:

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3.26 round to the nearest tenth
zaharov [31]
It's 3.3 because the 2 is in the tenths place and you look at 6 and say is it over 5? Yes it is so the next number after 2 is 3 so your answer is 3.3
7 0
3 years ago
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I need to find the perimeter and area of the regular polygon.
mezya [45]
The area of a polygon is given by the formula Area = ap/2 where a is the length of the apothem and p is the perimeter. The apothem is a line from the center of the polygon perpendicular to a side.

Depending on the formula you know, you can find the length of a side in 1 of 2 ways. 

The first way uses a triangle. Using the radius of the polygon you can create 8 congruent triangles. The center angle will be 360 / 8 = 45 and two side lengths of 20. You can find the length of the base using the law of cosines.

c^2 = 20^2 + 20^2 - 2(20)(20)(cos 45)
c^2 = 400 + 400 - 800(cos 45)
c^2 = 800 - 800(cos 45)
c = sqrt(800 - 800(cos 45)
c = 15.31

The second way is to use this formula:
r = s / (2 sin(180 / n))
20 = s / (2 sin(180/8)
(20)(2)sin(22.5) = s
(40)sin(22.5) = s
s = 15.31

We need to calculate the perimeter. As there are 8 sides (8)(15.31) = 122.48
Now we need to calculate the apothem using

a = S / (2 tan (180 / n)
a = 15.31 / (2 tan (180 / 8))
a = 18.48

Now solve for the area

Area = ap/2
Area = (18.48)(122.48)/2
Area = 1131.72

perimeter = 122.48
area = 1131.72
7 0
2 years ago
Hey answer this pls!!​
Kitty [74]

Answer:

That would be A) -3/5.

Step-by-step explanation:

Here it is.

6 0
2 years ago
If A = (1,2,3,4,5), then the number of proper subsets of A is- ​
Mandarinka [93]

Answer: One of them is the set {1,2,3,4,5,6}itself; one is the empty set, containing no elements. “Proper subset of a set ” usually denotes a subset in which at least one element of the original set is missing; so one of the subsets - the original set iitself - is not a proper subset. Therefore the answer is 63.

Step-by-step explanation:

8 0
3 years ago
To attend the class field trip, 24 students brought their permission slips.
mario62 [17]

Answer:

There are 30 students in the class

Step-by-step explanation:

we can write a ratio as:

8:10 as 24:x

Writing this as an equation gives:

8

10

=

24

x

We can now solve for

x

while keeping the equation balanced:

10

x

×

8

10

=

10

x

×

24

x

10

x

×

8

10

=

10

x

×

24

x

x

×

8

=

10

×

24

8

x

=

240

8

x

8

=

240

8

8

x

8

=

30

x = 30

7 0
2 years ago
Read 2 more answers
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