On teacher's day this year, Xiao Hong used color coated paper to make semicircular greeting cards, sharing 41.12cm long color rope. How many square centimeters of color cardboard did she use?

On teacher's day this year, Xiao Hong used color coated paper to make semicircular greeting cards, sharing 41.12cm long color rope. How many square centimeters of color cardboard did she use?

Radius 41.12 △ 2 + 3.14 = 41.12 △ 5.14 = 8cm
Area: 8x8x3.14x1/2 = 100.48cm2
A: 100.48 square centimeters