Height = 10/0cm

( 1)

Cylindrical volume

=3. 14×2.5? × 10

= 196.25 cubic centimeters

So use wood = 196.25÷2=98. 125 cubic centimeters.

(2)

Cylindrical side area

=3. 14×5× 10

= 157 cm2

So the side area of building blocks

= 157÷2=78.5 square centimeters

Cross-sectional area of building blocks

=5× 10

=50 square centimeters

So some areas of the painting

=50+78.5

= 128.5 cm2

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