In a circle with an 8-inch radius, a central angle has a measure of 60°. How long is the segment joining the endpoints of the ar
c cut off by the angle? 8 8√2 8√3
2 answers:
Answer:
The length of segment joining the endpoints of the arc is
Step-by-step explanation:
we know that
In the triangle ABC
see the attached figure to better understand the problem
-----> is the radius of the circle
----> given problem (central angle)
Initially the triangle ABC is an isosceles triangle
Remember that
the sum of the internal angles of triangle must be equal to
For this particular case, the isosceles triangle ABC becomes an equilateral triangle, as the three angles are equal to
The equilateral triangle has three equal sides and tree equal angles
so
Hence
The length of segment joining the endpoints of the arc is
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Answer:
X=80
Step-by-step explanation:
I suppose the graph will be like this:
Since isosceles trapezoid, red lines are parallel.
X+x+20= 180
2x+20=180
2x=160
X=80
Answer:
If we compare the p value and the significance level assumed we see that
so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the height of men actually its NOT significant higher than 0.3 at 1% of signficance.
Step-by-step explanation:
Data given and notation
represent the sample mean
represent the sample standard deviation for the sample
sample size
represent the value that we want to test
represent the significance level for the hypothesis test.
t would represent the statistic (variable of interest)
represent the p value for the test (variable of interest)
State the null and alternative hypotheses.
We need to conduct a hypothesis in order to check if the mean is higher than 3, the system of hypothesis would be:
Null hypothesis:
Alternative hypothesis:
If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:
(1)
z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".
Calculate the statistic
We can replace in formula (1) the info given like this:
P-value
Since is a one side test the p value would be:
Conclusion
If we compare the p value and the significance level assumed we see that
so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the height of men actually its NOT significant higher than 0.3 at 1% of signficance.