All categories

4 years ago

How do you find the surface area of a sphere?

Mathematics

1 answer:

Mamont248 [21]4 years ago

8 0

A=4πr^2 or in other words 4(3.14)r^2 (^2 stands for squared)

You might be interested in

State one form of the Law of Cosines and provide a trick for writing the other two forms and explain when Law of Cosines should

Yuki888 [10]

Solving for Angles

$\displaystyle \frac{a^2 + b^2 - c^2}{2ab} = cos∠C \\ \frac{a^2 - b^2 + c^2}{2ac} = cos∠B \\ \frac{-a^2 + b^2 + c^2}{2bc} = cos∠A$

* Do not forget to use the inverse function towards the end, or elce you will throw your answer off!

Solving for Edges

$\displaystyle b^2 + a^2 - 2ba\:cos∠C = c^2 \\ c^2 + a^2 - 2ca\:cos∠B = b^2 \\ c^2 + b^2 - 2cb\:cos∠A = a^2$

You would use this law under two conditions:

One angle and two edges defined, while trying to solve for the third edge
ALL three edges defined

* Just make sure to use the inverse function towards the end, or elce you will throw your answer off!

_____________________________________________

Now, JUST IN CASE, you would use the Law of Sines under three conditions:

Two angles and one edge defined, while trying to solve for the second edge
One angle and two edges defined, while trying to solve for the second angle
ALL three angles defined [of which does not occur very often, but it all refers back to the first bullet]

* I HIGHLY suggest you keep note of all of this significant information. You will need it going into the future.

I am delighted to assist you at any time.

7 0

3 years ago

What polynomial can be factored to give (a + 4) ( a - 4) ?

iragen [17]

Answer:

(a+4)(a-4)=a²-4² ITS LIKE THIS BECAUSE ITS AN IDENTITY,

⇒a²-16

Even when we solve it by the regular method of solving polynomials we get a²-16 as answer as there and thats the proof for the identity.

(a+b)(a-b)=a(a-4)+4(a-4)

⇒a²-4a+4a-16

⇒a²-16[NOTE:-4a+4a=0]

Thus we can see that a²-16 is the answer we get when we try to solve it by regular polynomial solution tooo.

And a²-16 is the polynomial from which we get (a+4)(a-4)

8 0

3 years ago

-48 = 6r What is R pls help

LenaWriter [7]

Answer:

the answer is -8

Step-by-step explanation:

pls give brainliest :)

8 0

3 years ago

Find the measure of the complement of an angle that measures 64°.

ioda

Complementary angles sum to 90°

the complement of 64° = 90° - 64° = 26°

8 0

3 years ago

How long will the sum of Rs 5,000 take to reach the amount RS 8750 at the rate of 15% per annum

Nonamiya [84]

Answer:

It will take 5 yrs the sum of 5000 will take to reach Rs 8750 at the rate 15%

Step-by-step explanation:

T= ?

Amount = Rs 8750

R = 15%

P = Rs 5000

I = A-P

= 8750 - 5000

= Rs 3750

I = PTR/100

3750 = (5000*15*T)/100

or, 375000 = 75000*T

or, T = 375000/75000

so T = 5 yrs

8 0

3 years ago