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3 years ago

Suppose the radius of a circle is \color{purple}{2}2start color purple, 2, end color purple units. What is its circumference?

Mathematics

1 answer:

Alenkinab [10]3 years ago

6 0

Answer:

$4\pi$ or 12.57 units

Step-by-step explanation:

It is given that the radius of a circle is 2 units.

We need to find the circumference of the circle.

The formula for circumference of a circle is

$C=2\pi r$

where, r is the radius of the circle.

Substitute r=2 in the above formula.

$C=2\pi (2)$

$C=4\pi$

Here, $\pi=\dfrac{22}{7}$

$C=4(\dfrac{22}{7})$

$C=\dfrac{88}{7}$

$C=12.57143$

$C\approx 12.57$

Therefore, the circumference of the circle is $4\pi$ or 12.57 units.

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One of the legs of a right triangle measures 4 cm and its hypotenuse measures 18 cm. Find the measure of the other leg. If neces

Aleks04 [339]

Answer:

√308 or 17.5

Step-by-step explanation:

c^2=a^2+b^2

c^2-a^2=b^2

Substitute

18^2-4^2=b^2

324-16=b^2

b^2=308

b=√308 or b=17.5

7 0

2 years ago

Solve log base 2 of one sixteenth.

irinina [24]

Answer:

-4

Step-by-step explanation:

log (2) (1/16)

2^4=16

fraction is negative exponent

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2 years ago

A long paper strip with a width of 5 cm is folded, as shown in the picture. Find the smallest possible area of the gray triangle

Stolb23 [73]

By using some logic and the formula of the triangle's area, we will find that the smallest possible area is 12.5 cm²

How to start thinking about the problem.

First of all, for the configuration of this paper strip, we can see that the base of the triangle will always be equal of the width of the paper. Thus, the smallest area will be only dependent of the height of the triangle.

Now, we need to analyze the picture to figure out how we can get the smallest height possible for that triangle.

What is the smallest height possible.

Doing this, we shall see that the smallest height possible is actually when the height equals the width itself, as it's shown in the attached image.

How to calculate the smallest area possible.

Thus, to calculate the smallest area, we just have to use the formula of the area of the triangle, which is $\frac{b\times h}{2}$ , where b is the base and h is the height.