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3 years ago

What is the angle rotational symmetry when the order is 20? A. 10 B. 360 C. 18 D.90

Mathematics

1 answer:

Ulleksa [173]3 years ago

4 0

Answer:

C. 18°

Step-by-step explanation:

The order of symmetry (n) is the number of times a shape fits onto itself during a complete turn through 360°.

The angle of rotational symmetry (θ) is the smallest angle through which the shape must be rotated to coincide with itself.

To find the angle, you divide the number of degrees in a circle by the order of symmetry.

θ = 360/n

= 360/20

= 18°

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the present age of prisca and Ashmaal are in ratio 2:3 . After 4 yrs the ratio of their ages will be 4:5 the present age of pris

Solnce55 [7]

Answer:

he Present age of Prisca will be 4 years .

Step-by-step explanation:

Given as :

The ratio of present age of Prisca and Ashmaal = 2 : 3

Let The present age of Prisca = 2 x years

Let The present age of Ashmaal = 3 x years

After 4 years , the ratio of present age = 4 : 5

i.e $\frac{ 2 x + 4}{3 x + 4}$ = $\frac{4}{5}$

Or, 5 × (2 x + 4) = 4 × (3 x + 4)

Or, 10 x + 20 = 12 x + 16

Or, 12 x - 10 x = 20 - 16

Or, 2 x = 4

∴ x = $\frac{4}{2}$

i.e x = 2

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And The present age of Ashmaal = 3 x = 3 × 2 = 6 years

Hence, The Present age of Prisca will be 4 years . Answer

4 0

4 years ago

Thank you for the help

koban [17]

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7 0

3 years ago

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Sherry claims that the expression 1x will always be equivalent to a repeating decimal whenever x is an odd number greater than 1

Zinaida [17]

This question is not complete

Complete Question

Sherry claims that the expression 1/x will always be equivalent to a repeating decimal whenever x is an odd number greater than 1.

Which of these values of x will prove Sherry's claim is false?

Answer:

When x = 5

Step-by-step explanation:

Sherry claims that the expression 1/x will always be equivalent to a repeating decimal whenever x is an odd number greater than 1.

Examples of odd numbers greater than 1 : 3, 5, 7, 9, 11 ....

We would put these odd numbers to test

a) When x = 3

= 1/3 = 0.3333333333

b) When x = 5

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c) When x = 7

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d) When x = 9

= 1/9 = 0.1111111111

e) When x = 11

= 1/11 = 0.0909090909

From the above calculation, we can see that the only odd number greater than 1 that will prove Sherry's theory wrong is when x = 5

Therefore, the value of x that will prove Sherry's claim is false is when x = 5

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