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In the sixth question of P58 in Grade 6, Shanghai Education Publishing House found the area of the following shadow part (1) (3).
(1) solution: n=360- 120=240.

s = 3. 14 *(R2 * R2-r 1 * r 1)

=3. 14*(64-25)

=3. 14*39

= 122.46 (square centimeter)

(3) Solution: S=2*S bow

S bow =3. 14*8*8\4-8*8/2

=50.24-32

= 18.24 (square centimeter)

S=2* 18.24

=36.48 (square centimeter)

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