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alexandr1967 [171]
3 years ago
11

How to do this question plz answer ​

Mathematics
2 answers:
Komok [63]3 years ago
6 0

Answer:

45° and 135°

Step-by-step explanation:

(a)

The sum of the angles around O = 360°

There are 8 segments from each vertex to O , thus

∠ AOB = 360° ÷ 8 = 45°

The sum of the interior angles of a regular polygon is

sum = 180° (n - 2) ← n is the number of sides

Here n = 8 , then

sum = 180° × 6 = 1080°

In a regular polygon the 8 interior angles are equal, thus

∠ ABC = 1080 ÷ 8 = 135°

Gre4nikov [31]3 years ago
6 0

9514 1404 393

Answer:

  a) angle AOB = 45°

  b) angle ABC = 135°

Step-by-step explanation:

a) The sum of the 8 identical central angles is 360°, so each one has a measure of ...

  angle AOB = 360°/8 = 45°

__

b) The sum of the 8 exterior angles is 360°, so each one is 45°, the same measure as the central angle. The measure of angle ABC is the supplement of the exterior angle at B, so is ...

  angle ABC = 180° -45° = 135°

_____

In the attached image, the central point is your O. Angle AOB is the interior angle of triangle AOB whose vertex is at O.

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Answer:

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Step-by-step explanation:

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3 years ago
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Help me to solve this question plez!!
dimaraw [331]

Let  First Sphere be the Original Sphere

its Radius be : r

We know that Surface Area of the Sphere is : 4π × (radius)²

⇒ Surface Area of the Original Sphere = 4πr²

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4 years ago
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HACTEHA [7]
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6 0
3 years ago
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joja [24]

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Evaluate 1/2a^-4b^2 for a =-2 and b=4

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A number raised to a negative exponent is sometimes negative.

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great Valentines Day! :-)  

- Cutiepatutie ☺❀❤

8 0
3 years ago
In ABC, the interior angle at A is 51° and the exterior angle at B is 119º. The interior angle at C measures
erastova [34]

Answer:

68 degrees

Step-by-step explanation:

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7 0
3 years ago
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