First:The area of a circle is πr squared. Not r2
Second. The area of the circle HAS to be irrational because π is an irrational number. The answer would be, if solved for a circle with the radius of 0.75, the area would be 0.5625π, which is irrational.
Answer:
200 people
Step-by-step explanation:
I did the math on my calculator
Answer:
125.60
Step-by-step explanation:
the formula for the area of a cylinder is A=2πRH+2πRsquared. I find it easiest to multiply pi by 2 instead of anything else which is 6.28. Then I multiply the radius (2) times the height (8) equaling 16. Then you multiply that number by 6.28. Equaling 100.48. Then you have to do the second part which is radius (2) squared equaling 4. Then you multiply that by 6.28, equaling 25.12. then you add the two sums (25.12+100.48=125.60).
hope that makes sense!!
Answer:
c ≈ 9.1 m
Step-by-step explanation:
Using Pythagoras' identity in the right triangle.
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides , that is
c² = 4.1² + 8.1² = 16.81 + 65.61 = 82.42 ( take square root of both sides )
c = 
≈ 9.1 m ( to the nearest tenth )
Step-by-step explanation:
7. x^2 - 4x
a= 1
b= -4
c= 0
8. 2x^2 -3x +1
a= 2
b= -3
c= 1
9. 9x^2 - 4
a= 9
b= 0
c= -4
10. x^2 +12x +36
a= 1
b= 12
c= 36
11. x^2 -9x + 9
a= 1
b= -9
c= +9
12. - (x^2 + 10x + 25)
= -x^2 -10x - 25
a= -1
b= -10
c= -25
