Discussion
A hexagonal pyramid of 30 mm base side has a development whose total arc-wise base length is
Answer: B
Correct answer: 180 mm
The base edges of the six triangular faces lie end to end along the bottom of the pattern, so their total is the base perimeter: \[ 6 \times 30 = 180\ \mathrm{mm}. \] It is called an arc-wise length because the faces fan about the apex, so the base line of the pattern is not straight.
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