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oksano4ka [1.4K]
3 years ago
8

Measurement and Geometry 11. What would the total interior angles be for a 21 sided shape?

Mathematics
2 answers:
svetlana [45]3 years ago
8 0

Answer: 3420 degrees

Explanation: You use the formula 180(n-2) with n = 21 to find the answer above.

Rzqust [24]3 years ago
4 0

Answer:

sum_of_interior_angles = (number_of_sides - 2) x 180° → if number_of_sides is 21: sum = (21 - 2) x 180° = 19 x 180° = 3420°

Step-by-step explanation:

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(c) Emma changed her statement to say that when you multiply two negative decimals and a positive decimal, the product will be p
Kryger [21]
The statement is always true.

Let's take -.12*-.5*.2

-.12*-.5*.2=.012

And:
-.2*-.4*.3=.024

A positive multiplied by a positive is, obviously, a positive.

The result of two negative numbers multiplying together is always positive.

So, negative*negative*positive is a positive answer.
4 0
4 years ago
Read 2 more answers
2. Two angles have a common vertex but no common side. How can you tell whether the angles are vertical angles?
Maksim231197 [3]

Explanation:

The angles are <em>vertical angles</em> if the opposites of the rays forming one of the angles are the rays forming the other angle.

More formally, if V is the common vertex, and ...

  • R is a point on one of the rays forming Angle 1
  • S is a point on the ray that is the opposite of ray VR
  • T is a point on the other ray forming Angle 1
  • U is a point on the ray that is the opposite of ray VT

Then angle RVT and angle SVU are vertical angles.

___

Another way to say this is that points R, V, S are collinear, as are points T, V, U, and the two angles of interest are RVT and SVU.

If the above conditions cannot be met, then the angles are not vertical angles.

7 0
4 years ago
Evaluate. 9 - 0.224 + 3.2
Xelga [282]

Answer:

11.976

Step-by-step explanation:

9 - 0.224 + 3.2

= 8.776 + 3.2

= 11.976

7 0
4 years ago
If a set of sample measurements has a mean of 100, a normal distribution, a standard deviation of 2, and control limits of 94 an
weeeeeb [17]

Answer: 99.73%

Step-by-step explanation:

Given : Mean : \mu=100

Standard deviation : \sigma=2

Let X be the random variable that represents the data values.

Formula for Z-score :  z=\dfrac{X-\mu}{\sigma}

For x=94, we have

z=\dfrac{94-100}{2}=-3

For x=106, we have

z=\dfrac{106-100}{2}=3

The probability that the samples are between 94 and 106:-

P(-3

Hence, the percent of the samples are expected to be between 94 and 106 = 99.73%

6 0
3 years ago
Which equation represents a circle with its center at (2, -3) and that passes through the point (6,2)?
White raven [17]

Answer:

An equation represents a circle with its center at (2, -3) and that passes through the point (6,2) is:

(x - 2)² + (y + 3)² = 41

Step-by-step explanation:

The standard equation of a circle having the center at point C(x₀, y₀) and radius r is given by

(x - x₀)² + (y - y₀)² = r²

It means that every point  P(x, y) belonging to the circle must satisfy the equation.

In this particular case, we have that the circle passing through P(x, y) = (6, 2) and the center C(x₀, y₀) = (2, -3).

Then substituting these values in the formula:

(x - x₀)² + (y - y₀)² = r²

(6 - 2)² + (2 - (-3))² = r²

switch sides

r² = (6 - 2)² + (2 - (-3))²

r² = (4)² + (2 + 3)²

r² = (4)²+ (5)²

r² = 16 + 25

r² = 41

r = √41, r = -√41

As r can not be negative, so

r = √41

Therefore , the equation of the circle with center at C = (2, -3) and radius r = √41 is:

(x - 2)² + (y + 3)² = (√41 )²

(x - 2)² + (y + 3)² = 41

Therefore, an equation represents a circle with its center at (2, -3) and that passes through the point (6,2) is:

(x - 2)² + (y + 3)² = 41  

3 0
3 years ago
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