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3 years ago

10

Need help somebody help me plz

1 answer:

Wewaii [24]3 years ago

5 0

Hello,
The formula for finding the circumference of a circle is $2 \pi r$ where r is the radius. SO we can plug 4 in for r in this formula because 4 is the radius: $2 \pi 4=8 \pi$ . We are told to use 3.14 for $\pi$ so we get $8(3.14)=25.12$ . Therefore, the circumference is 25.12 meters.

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2 years ago

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The midpoint of AB is M(-5,1). If the coordinates of A are (-4,-5), what are the coordinates of B?

Elenna [48]

<u>ANSWER:</u>

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<u>SOLUTION: </u>

Given, the midpoint of AB is M(-5,1).

The coordinates of A are (-4,-5),

We need to find the coordinates of B.

We know that, mid-point formula for two points A $(x_{1}, y_{1})$ and B $(x_{1}, y_{2})$ is given by

$M\left(x_{3}, y_{3}\right)=\left(\frac{x_{1}+x_{2}}{2}, \frac{y_{1}+y_{2}}{2}\right)$

Here, in our problem, $\mathrm{x}_{3}=-5, \mathrm{y}_{3}=1, \mathrm{x}_{1}=-4 \text { and } \mathrm{y}_{1}=-5$

Now, on substituting values in midpoint formula, we get

$(-5,1)=\left(\frac{-4+x_{2}}{2}, \frac{-5+y_{2}}{2}\right)$

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$\frac{-4+x_{2}}{2}=-5 \text { and } \frac{-5+y_{2}}{2}=1$

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Hence, the coordinates of b are (-6, 7).

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3 years ago