Math mini-contest problem for Day 7 on D.Buzz for March 2021 😎

Math problem for Day 7 for March 2021 😎

Holovision's hemispherical dome for his holography project needs painting. The diameter of the sphere is 3 meters long. If he covered the hollow part with flat cardboard, what is the surface area of the hemisphere?

H2
H3
H4
3 columns
2 columns
1 column
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