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To find the slant height of the cone, we can use the Pythagorean Theorem, which states that the square of the hypotenuse (slant height in this case) is equal to the sum of the squares of the other two sides.
So, in this case, the height of the cone is 6 cm and the radius (half the diameter) is 6.5 cm. Applying the Pythagorean Theorem:
hypotenuse^2 = height^2 + radius^2
hypotenuse^2 = 6^2 + 6.5^2
hypotenuse^2 = 36 + 42.25
hypotenuse^2 = 78.25
hypotenuse ≈ √78.25
hypotenuse ≈ 8.8
Therefore, the slant height must be approximately 8.8 cm, so the correct answer is:
b. 8.8 cm.