$\"\"$

Surface area of each crystal is $\"\"$ square meter.

$\"\"$ (Write $\"\"$ )

$\"\"$ (Definition of negative exponent)

Therefore surface area is $\"\"$ square meter. $\"\"$

Total crystals $\"\"$ .

Total area of all crystals on a single brittle star = $\"\"$ .

$\"\"$ (Product of powers property: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

Total area of all crystals on a single brittle star is $\"\"$ square meter. \ \