2 years ago

I need to know the circumference to this and area of this circle

Mathematics

1 answer:

Ostrovityanka [42]2 years ago

7 0

Answer:

C = 21.98 ft^2

A = 38.465 ft^2

Step-by-step explanation:

The diameter is 7 ft

The radius is 1/2 of the diameter so 1/2 *7 = 3.5 ft

Circumference = pi*d

C =pi* 7

C =3.14 *7

= 21.98 ft^2

A = pi*r^2

= 3.14 (3.5)^2

= 3.14 (12.25)

= 38.465 ft^2

You might be interested in

How do you write a percent into a fraction or a mixed number in simplest form

love history [14]

To change a percent to a fraction, you remove the percent sign and put the given number over 100. For example, if you are given 78%, it would be 78/100 or 39/50

4 0

2 years ago

18. cos t(sec t - cos t)

Margarita [4]

$\bf sin^2(\theta)+cos^2(\theta)=1\implies sin^2(\theta)=1-cos^2(\theta)\\\\
sec(\theta)=\cfrac{1}{cos(\theta)}
\\\\
-----------------------------\\\\
cos(t)[sec(t)-cos(t)]\implies cos(t)sec(t)-cos(t)cos(t)
\\\\\\
cos(t)\cdot \cfrac{1}{cos(t)}-cos^2(t)\implies 1-cos^2(t)\implies \boxed{sin^2(t)}$