Answer:

Step-by-step explanation:
A rectangle is inscribed in a circle of radius r.
Radius of the circle is 'r' . the diameter of circle is 2 times radius is 2r
The diameter of the circle becomes the diagonal of the rectangle.
The one part of the rectangle forms a triangle with hypotenuse 2r
Triangle is a special 30:60:90 degree angle
the ratio of the special triangle is 
Hypotenuse is '2r' , so the ratio becomes

So the width of the rectangle is 'r' and length of the rectangle is 
Perimeter = 2 times length + 2 times width

Answer:
- 45
Step-by-step explanation:
let n be the number , then
n - 11 = n + 4 ( add 11 to both sides )
n = n + 15 ( multiply through by 3 to clear the fraction
2n = 3n + 45 ( subtract 2n from both sides )
0 = n + 45 ( subtract 45 from both sides )
- 45 = n
The number is - 45
Answer:
D
Step-by-step explanation:
Volume for a sphere: 4/3(pi)r^3
4/3(pi)(1x1x1)= 4/3pi
hope this helped :)
Answer: x=0
Step-by-step explanation:
I believe the answer is d