Tolong dibantu nomor yang dilingkarin. Jawab yang benar.. Terima kasih

2.
b. 1/2 × 10 × 10 × 3,14 = 1/2 × 314 = 157 cm2

c. 2/3 × 21 × 21 × 22/7 = 14 × 3 × 22 = 924 cm2


3.
a. bangun l = 28 × 24 = 672 cm2
bangun ll = 1/2 × 14 ×14 × 22/7 = 14 × 22 = 308 cm2
l + ll = 672 + 308 = 980 cm2

b. bangun l = 1/2 × 42 × 18 = 21 × 18 = 378 cm2
bangun ll = 1/2 × 21 × 21 × 22/7 = 3 × 21 × 11 = 693 cm2
l + ll = 378 + 693 = 1071 cm2

f. bangun l { arsiran } = 1/2 × 42 × 42 × 22/7 = 3 × 42 × 22 = 2772 cm2
bangun ll { bukan arsiran } = 1/2 × 14 ×14 ×22/7 = 14 × 22 = 308 cm2
l - ll = 2772 - 308 = 2464 cm2


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