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3 years ago

Work out your perimeter of a semicircle with raduis 3cm give your answer in terms of pie

Mathematics

2 answers:

Marrrta [24]3 years ago

8 0

Answer:

18.84 cm

Step-by-step explanation:

P = 2 × pi × r

= 2 × 3.14 × 3cm

= 6cm × 3.14

= 18.84 cm

Thepotemich [5.8K]3 years ago

7 0

Answer:

9/2 π

Step-by-step explanation:

$Perimeter = \frac{\pi r^2}{2} \\r = 3\:cm\\\\P = \frac{\pi \times 3^2}{2}\\ \\P = \frac{\pi \times 9}{2}\\ \\P = \frac{9 \pi}{2} \\\\P = \frac{9}{2} \pi$

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3 years ago

Find the solution set of this inequality|10x+20| ≤10

Pavlova-9 [17]

Answer:

solution is

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Step-by-step explanation:

we are given

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For $(-\infty,-3)$ :

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we can plug x=-5

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For $[-3,-1]$ :

We can select any random value from this interval and plug that in inequality

and we get

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For $(-1,\infty)$ :

We can select any random value from this interval and plug that in inequality

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$|10\times 0+20|\leq 10$

$|0+20|\leq 10$

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so, solution is

[-3,-1]

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Answer:

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