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valentina_108 [34]
3 years ago
5

The sum of the four angles in a rectangle is always 180 degrees true or false?

Mathematics
2 answers:
dem82 [27]3 years ago
7 0
A rectangle has 4 sides
each side is a right angle
a right angle by definition is 90 degrees
90 + 90 + 90 + 90 = 360\\ or\\ 90 * 4 = 360
False
Valentin [98]3 years ago
3 0
False because each side is 90° making it a total of 360° therefore it’s false
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Please help me with this
xenn [34]

Step-by-step explanation:

based on my understanding of the dreidel, this is a regular spinner with 4 equal sides (but different symbols on them, so, we can clearly distinguish between the possible 4 different outcomes).

in other words, this resembles a die with only 4 sides and therefore only 4 equally probable outcomes.

and therefore, the probability to get the specified symbol in 1 attempt is indeed 1/4.

remember, a probability is always desired cases over totally possible cases.

and here, we have one desired outcome out of 4 possible outcomes. hence the probability of 1/4.

now, we are spinning the dreidel twice.

that means we have now 4×4 = 16 possible outcomes.

but we only want the outcomes, where the specified symbol is showing exactly once - either after the first spin or after the second spin.

so, out of the 16 possible combinations, we want only the ones, where the first spin delivered that result :

1 option on the first spin and 3 options (4 minus the already delivered result) on the second spin : 1×3 = 3.

and the ones, where the second spin delivered the result (but not the first). so, we have 3×1 = 3 options there.

that means we have 6 desired cases out of total 16 possible outcomes, and the probability is

6/16 = 3/8

mathematically we would simply say that the probability is the sum of

the probability of spinning it first combined with the probability of not spinning it second.

the probability of not spinning it first combined with the probability to spin it second.

that is

1/4 × 3/4 = 3/16

+

3/4 × 1/4 = 3/16

-----------------------

6/16 = 3/8

I don't know the options you can select, but I hope you understand the principles I explained. and I gave you the result and the way to calculate it.

so, hopefully you find the fitting options.

8 0
2 years ago
Find f of 1 and f of 4
Dafna1 [17]
You have to check f(1) in each one to see if it's right and for f(4)

4 0
3 years ago
consider the point (x,y) lying on the graph of y=(x+3)^1/2. let L be the distance between the points (x,y) and (4,0). write l as
olga_2 [115]
L=\sqrt{ (x-4)^2 + y^2 }
and 
y=\sqrt{x+3} \Rightarrow x = y^2-3

L=\sqrt{ (x-4)^2 + y^2 }=\sqrt{ (y^2 - 3-4)^2 + y^2 }=\sqrt{ (y^2-7)^2 + y^2 }


6 0
3 years ago
A bag contains blue marbles and red marbles, 66 in total. The number of blue marbles is 9 less than 4 times the number of red ma
Westkost [7]
51 blue marbles is the answer
3 0
3 years ago
Read 2 more answers
Best bicycles marks down the selling price of its bicycles to its customers. the company applies a 20% markdown.write a variable
tangare [24]
A=P×(0.8)
A is the price after the markdown
P is the original price
0.8 is the multiplier because 1-(80/100)=0.8
80/100 is the same as 80%, which is the remaining value when 20% of the value of the item is deducted.
6 0
3 years ago
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