Answer:
80 m.
Steps: perimeter =4 x side
=4x20=80m
The volume of cone is 24
or 75.398 cubic centimeters, if the cone has a radius of 3 centimeters and height of 8 centimeters.
Step-by-step explanation:
The given is,
Formula for volume of cone, 
Where, B = 
Volume, 
From the given,
Radius, r = 3 centimeters
Height, h = 8 centimeters
volume, 



Volume of cone, V= 24
(volume in terms of
)
( or )
Volume, V = (24 × 3.14 ) ( ∵
=3.14 )
V = 75.398 cubic inches
Result:
The volume of cone is 24
or 75.398 cubic centimeters, if the cone has a radius of 3 centimeters and height of 8 centimeters.
Use the pythagorean theorem:

where c is the hypotenuse of the triangle.
1) Answer: 
<u>Step-by-step explanation:</u>
f(x) = 6x⁻¹
f'(x) = -6x⁻²
= 
f'(-2) = 
= 
= 
*****************************************************
2) Answer: 
<u>Step-by-step explanation:</u>
f(x) = -9x⁻¹
f'(x) = 9x⁻²
= 
f'(6) = 
= 
= 