Which of the following formulas would find the lateral area of a right cone where r is the radius and s is slant height?
2 answers:
For a right circular cone, the lateral surface area is given by,
The value of square root of h²+r² is equal to slant height s.
So replacing the value of square root of (h²+r²) by s in the formula for lateral surface area , we have
L.S.A. = pi * r * s
where s is slant height of the given right cone.
Answer: The lateral surface area of a right cone is pi*r*s.
Option C is the correct answer.
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The value of cos A is √(1 + x²)/ (1 - x²) /√1 + x
<h3>Trigonometric ratios</h3>
It is important to note that
sin A = opposite/ hypotenuse
cos A = adjacent/ hypotenuse
Then,
opposite =
Hypotenuse =
Let's find the adjacent side using the Pythagorean theroem
cos A = x/hypotenuse
cos A = √(1 + x²)/ (1 - x²) /√1 + x
Thus, the value of cos A is √(1 + x²)/ (1 - x²) /√1 + x
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