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Alona [7]
3 years ago
9

Find the size of each interior angle in a regular octagon

Mathematics
2 answers:
vodka [1.7K]3 years ago
8 0
The formula for finding the measure of interior angles in a regular octagon is

(the number of sides the shape has - 2) * 180/ the number of sides

(8-2) *180/ 8

6*180/ 8 =     1080/8 = 135

The size of each interior angle in a regular octagon is 135°
AnnyKZ [126]3 years ago
3 0
To do this you divide 360 by 8 which equals 45
The exterior angle is 45°
So to find the interior angle you do 180-45=135
So one interior angle is 135°
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I NEED HELP ASAP Find the area of the trapezoid by decomposing it into other shapes.
disa [49]

Answer:

Area of the trapezoid is 38 cm²

Step-by-step explanation:

  • Step 1: Area of the trapezoid can be found by decomposing it into 2 triangles and a rectangle.
  • Step 2: Find area of first triangle. Given base = 5 cm and height = 4 cm

Substitute in formula for area of triangle = 1/2 base * height

Area of triangle, A1 = 1/2 * 5 * 4 = 10 cm²

  • Step 3: Find area of rectangle. Given breadth = 4 cm (Same as height of triangles) Length = 6 cm. Substitute in formula for area of rectangle = length * breadth

Area of rectangle, A2 = 4 * 6 = 24 cm²

  • Step 4: Find area of second triangle. Given height = 4 cm (same as the other triangle) and base = 2 cm (8 cm - 6 cm)

Substitute in formula for area of triangle = 1/2 base * height

Area of triangle, A3 = 1/2 * 2 * 4 = 4 cm²

  • Step 5: Calculate total area = A1 + A2 + A3 = 10 + 24 + 4 = 38 cm²
7 0
3 years ago
Sets A,B , and C are subsets of the universal set U.
Debora [2.8K]

B'=\{f,g,h,p,x\}\\B'\cup A=\{f,g,h,p,q,r,x\}\\(B'\cup A)\cap C=\{g,h,p,q\}

3 0
2 years ago
Need help! Law of cosines...find b round to the nearest tenth please
dusya [7]
ANSWER

B = 27.8 \degree

EXPLANATION

The law of cosine is given by the formula:

{b}^{2} = {a}^{2} + {c}^{2} - 2bc \cos(B)

From the diagram,

a=17, b=8, c=16

We substitute the given values into the formula to obtain:

{8}^{2} = {17}^{2} + {16}^{2} - 2(17)(16)\cos(B)

64 = 289+ 256- 544\cos(B)


64 = 545- 544\cos(B)


64 - 545 = - 544\cos(B)

- 481 = - 544\cos(B)

\frac{ - 481}{ - 544} = \cos(B)

cos(B) = 0.88419

B = \cos ^{ - 1} (0.88419)

B = 27.8 \degree
3 0
3 years ago
Read 2 more answers
Factor by grouping <br> 6x^2-12x+x-2<br> factor completely
Marianna [84]
Uh ye here you go stranger hoped this help

5 0
3 years ago
Please help and explain. Thank you!
Anvisha [2.4K]

Answer:

For the first question, the answer is 216 and the equation would become just 6^3

For the second, the answer is 9.

Step-by-step explanation:

When there is a negative exponent, that monomial is brought up to the top of the fraction, (the numerator) so 1/6^-3 becomes 1(6^3)/1, or simplified, just 6^3 since divided by one is the same number and times one is the same number. 6 x 6 x 6 is 216.

When there is a negative exponent outside the equation in a <u>fraction,</u> you need to take the reciprocal  of the fraction. Since it's squared, it will always be positive, so we can ignore the negative sign. 3/1 (or just 3) to the power of 2 is 9. (3 x 3 is 9).

When explained throughly this might be found confusing, but it's a very easy concept to get after a while.

8 0
3 years ago
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