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3 years ago

A regular polygon has possible angles or rotational summetry of 20, 40, and 80 degrees. How many side does the polygon have?

Mathematics

2 answers:

Pavlova-9 [17]3 years ago

5 0

Answer:

Step-by-step explanation:

Ed2020

BARSIC [14]3 years ago

3 0

Answer:

The number of sides regular polygon have = 18

Step-by-step explanation:

The possible angle or rotational symmetry is 20° , 40° , 80° of any regular polygon .

now,

Symmetrical under 20° Rotation is also symmetrical on rotation of any multiple of 20°

So, number of sides = n = $\frac{360}{External angle}$

I.e n = $\frac{360}{20}$

So, n = 18

Hence the number of sides the polygon have 18 Answer

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Find the domain of f/g f(x) = square root 4-x^2 g(x) = Square root 3x+4

Ierofanga [76]

Answer:

(-4/3,2]

Step-by-step explanation:

Remember the bracket that I placed

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Answer:

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please help as soon as possible-Solve the right triangle shown in the figure. WIll mark brainliest to first correct answer

Dennis_Churaev [7]

Answer:

option a is the correct answer; ∠A = 68°, ∠B = 22°, AB = 2.9 cm

Step-by-step explanation:

From my understanding, we have to find angle A, angle B and side AB.

Step 1: Find side AB

AB can be solved through the Pythagoras theorem.

c² = a² + b²

c² = 2.7² + 1.1²

c² = 8.5

c = √8.5

c = 2.9 cm

Step 2: Find angle A

Angle A can be found through tan formula

tan (angle) = opposite/adjacent

tan (angle A) = BC/AC

tan (angle A) = 2.7/1.1

Angle A = tan inverse (2.7/1.1)

Angle A = 68°

Step 3: Find angle B

All 3 angles of a triangle are equal to 180°

Angle A + Angle B + Angle C = 180°

68 + B + 90 = 180°

Angle B = 22°

option a is the correct answer; ∠A = 68°, ∠B = 22°, AB = 2.9 cm

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3 years ago

Which transformation shows that the two given circles are similar? Circle A -- center(2, 0), radius 8 Circle A' -- center(-1, 5)

Goryan [66]

Translate Circle A (x-3, y+5) and then dilate by a scale factor of 3/8 or 0.375

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C Solve for m: 3/4m - 3 = 9 May I please have help!

MAVERICK [17]

Answer:

m=16

Step-by-step explanation:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation : 3/4*m-3-(9)=0

Step 1: Simplify 3/4

Equation at the end of step 1: ((3/4 x m) - 3) - 9 = 0

Step2: Subtracting a whole from a fraction

Rewrite the whole as a fraction using 4 as the denominator :

3 3 • 4

3 = — = —————

1 4

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

3m - (3 • 4) 3m - 12

—————4——————— = ———4————

When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

3•(m-16)

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Now, on the left hand side, the 4 cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :

3 • (m-16) = 0

6.2 Solve : 3 = 0

This equation has no solution.

A a non-zero constant never equals zero.

Solve : m-16 = 0

Add 16 to both sides of the equation :

m = 16

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