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= 3/4 × 3,14 × 24 × 24
= 1356,48 cm² (C)
22. Luas 3/4 lingkaran = 3/4 × πr²
= 3/4 × 22/7 × 28 × 28
= 1848 cm²
Luas persegi = s × s
= 28 × 28
= 784 cm²
Luas bangun = 1848 cm² + 784 cm² = 2632 cm² (D)
23. Keliling 3/4 lingkaran = 3/4 × 2πr
= 3/4 × 2 × 22/7 × 28
= 132 cm
Keliling 2 sisi persegi = 28 + 28
= 56 cm
Keliling bangun = 132 cm + 56 cm = 188 cm
*Yang ditanyain keliling, tapi jawabannya adanya luas. Kalo yang ditanyain luas, jawabannya sama dengan nomer 22.
24. Volume tabung = πr²t
= 3,14 × 12 × 12 × 17,5
= 7912,8 cm²
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