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24.
r = 21 cm

Luas = π.r²
L = 22/7 x 21 x 21
L = 22 x 3 x 21
L = 66 x 21
L = 1.386 cm²

Jawaban D

25.
Keliling Bangun I = 24 cm + 47 cm + 45 cm + (47 - 21) cm
                            = 24 + 47 + 45 + 26
                            = 142 cm

Keliling Bangun II = 120/360 x 2.π.r
                         = 1/3 x 2 x 22/7 x 21
                         = 1/3 x 2 x 22 x 3
                         = 2 x 22
                         = 44 cm

Keliling seluruhnya = 142 cm + 44 cm = 186 cm

Jawaban D