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guajiro [1.7K]
3 years ago
8

Fill in the blank. In the triangle below, z^o=______^o.

Mathematics
2 answers:
elena55 [62]3 years ago
4 0
ANSWER
z  =  43 \degree
EXPLANATION


We want to calculate the value of the angle marked z° in the diagram.

Since the given diagram is a right angle triangle, one of the angles is 90°.


The sum of the angles in a triangle is 180°.


This implies that,

z + 90 \degree+ 47 \degree =  180 \degree


We group like terms to obtain,

z  =  180 \degree - 90 \degree -  47 \degree


We simplify to obtain,


z  =  43 \degree


GarryVolchara [31]3 years ago
4 0

Answer:

z=43^{\circ}

Step-by-step explanation:

We have been given a right triangle. We are asked to find the measure of angle z for our given triangle.

We know that all interior angles of a triangle add up-to 180 degrees. Using angle sum property, we can set an equation as:

z+47^{\circ}+90^{\circ}=180^{\circ}

z+137^{\circ}=180^{\circ}

z+137^{\circ}-137^{\circ}=180^{\circ}-137^{\circ}

z=43^{\circ}

Therefore, the value of z is 43 degrees.

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● For the polygon you are assigned, assume the radius is 1 unit . Round all answers to the nearest hundredth , if necessary.
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Answer:

  1) 135°

  2) 0.77 units

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  5) 2.83 square units

Step-by-step explanation:

1) The exterior angle at any vertex is 360°/n, where n is the number of sides. For the octagon, the exterior angle is 360°/8 = 45°. The interior angle will be the supplement of this: 180° -45° = 135°.

The measure of each interior angle is 135°.

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2) Each sector of the octagon is an isosceles triangle with a central angle of 45° (also 360°/8). Since the radius is 1 unit, the length of one side is twice the sine of half the central angle.

  s = 2·sin(45°/2) ≈ 0.765367

The length of one side is about 0.77 units.

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3) Similarly, the apothem is the cosine of half the central angle:

  a = cos(45°/2) ≈ 0.923880

The apothem is about 0.92 units.

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4) For an octagon, the perimeter is 8 times the length of one side.

  P = 8s = 8(0.765367) ≈ 6.12293

The perimeter is about 6.12 units.

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5) The area of one sector (isosceles triangle) is given by the formula ...

  A = (1/2)bh

  A = 1/2sa ≈ 1/2(0.765367)(0.923880) ≈ 0.353553

Then the area of the octagon is 8 times this:

  A = 8(sector area) = 8(0.353553) ≈ 2.82843

The octagon area is about 2.83 square units.

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4 0
4 years ago
A line for tickets to a Broadway show had a mean waiting time of 20 minutes with a standard deviation of 5 minutes.
andrezito [222]

Answer:

5.48% of the people in line waited for more than 28 minutes

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean waiting time of 20 minutes with a standard deviation of 5 minutes.

This means that \mu = 20, \sigma = 5

What percentage of the people in line waited for more than 28 minutes?

The proportion is 1 subtracted by the p-value of Z when X = 28. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{28 - 20}{5}

Z = 1.6

Z = 1.6 has a p-value of 0.9452.

1 - 0.9452 = 0.0548.

As a percentage:

0.0548*100% = 5.48%

5.48% of the people in line waited for more than 28 minutes

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