6 vertices is in a triangular prism
She has two days because 4/5=8/10 3 time two is 6.

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step by step explanation </h3>
● area of regular polygon Formulas ,
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● now finding the area of regular polygon,
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Hope it's helps you
Given that variance of a data set is:
Variance=σ²
the standard deviation is the square root of the variance:
thus
standard deviation= √(variance)
variance,σ²=104.04
thus
std deviation=√σ²=√104.04
thus
σ=10.2
6, 12, 18
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