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LiRa [457]
3 years ago
12

Find the area and perimeter or circumference of each figure:

Mathematics
2 answers:
Rus_ich [418]3 years ago
5 0
A) area: 3^2pi = 9pi cm or 28.27 cm
Perimeter/ circumference: 2*3pi = 6pi cm or 18.85 cm
b) 10/2 = 5 (radius)
area: 5^2pi = 25pi feet or 78.54 feet
Perimeter/circumference: 2*5pi = 10pi feet or 31.42 feet
Vera_Pavlovna [14]3 years ago
4 0

Do Circumfrence over diameter then add pi? I think

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Answer: x = pi/6 and x = pi/3.

Step-by-step explanation:

We have the function:

y = x + 2*cos(x)

It will have a horizontal tangent at the point where it's derivate is equal to zero.

Then first let's differentiate y.

y' = dy/dx = 1 - 2*sin(x).

Then we must find the value of x between 0 and 2*pi (or 0° and 360°)

y'(x) = 1 - 2*sin(x) = 0.

Let's solve that:

2*sin(x) = 1

sin(x) = 1/2.

We know that:

sin(30°) = 1/2.

and

Sin(120°) = 1/2

Then let's convert 30° into radians.

We know that:

pi = 180°.

Then:

pi/180° = 1.

30° = 30°*(pi/180°) = (30°/180°)*pi = (3/18)*pi = pi/6

120° = (120°/180°)*pi = (12/18)*pi = (1/3)*pi = pi/3.

Then the two values of x are: pi/6 and pi/3.

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2 years ago
2/5 divided by 1/8. Simplest form
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Step-by-step explanation:

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