Answer:
Area:80mi^2
Perimeter:40mi
Step-by-step explanation:
Solution-
First 9 letters of alphabet are- A,B,C,D,E,F,G,H,I
Total number of ways of selection of 4 letters from 9 alphabets = 9C4
=9!÷((4!).(9-4)!) = 9!÷(4!×5!) = (9×8×7×6)÷(24) = 126
The number of ways of arranging these 4 numbers = 4! = 24
∴ Total number of possible permutations = 9C4×4! = 126×24 = 3024
∴ option number 2 is correct.
Answer:
36π inches
Step-by-step explanation:
Formula for the area of a circle is A = π r^2
Plug in 6 for r into the equation. A = π 6^2
A = 36π
Answer:option c
Step-by-step explanation:
The surface area of a right circular cone is SA =<span>
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The diameter (d) is equal to 20 meters and half of it is equal to the radius which is 10 meters.
The height (h) of the tank is equal to 42 meters.
Substituting the given to the equation:
SA =
= 1670.51 square meters or the closest answer is 1,671 m2