Hello!
To find the surface area of a sphere you use the equation

A is surface area
r is radius which is half the diameter
Put in the values you know

Square the number

Multiply the 4 and the 39.0625

The answer is

Hope this helps!
Sixty-nine thousand, a hundred and eight?
Answer:
x = - 4 , x = - 3
Step-by-step explanation:
- 7x = x^2 + 12
Take all terms to one side of equation.
x^2 + 7x + 12 = 0
Find which 2 numbers multiply to give 12 and add to give 7.
a × b = 12
a + b = 7
a = 4
b = 3
Split the middle term using these 2 numbers.
x^2 + 4x + 3x + 12 = 0
Factorise each pair of terms separately.
x ( x + 4 ) + 3 ( x + 4 ) = 0
Bring out common factor of ( x + 4 ) and factorise.
( x + 4 ) ( x + 3 ) = 0
Using the Null factor law, make the expressions in each pair of parentheses equal 0.
x + 4 = 0
x = - 4
AND
x + 3 = 0
x = - 3
THEREFORE:
x = - 4 , x = - 3
AA Similarity Postulate - we get the triangle on the left's angles; 90 and 63, and we subtract from 180.
180 - 90 - 63 = 27
So we have angle measures 27, 63, 90
For the triangle on the right, with measures 27 and 90, we use the same idea:
180 - 90 - 27 = 63.
You'll see that we also have 27, 63, 90.
Triangles with the same angles are defined as similar, so AA should be the answer
Answer:
Step-by-step explanation:
the answer is 13 and 2.2