Jawaban:
a. 308 cm²
b. 189 cm²
Penjelasan dengan langkah-langkah:
a.
1/4πR² - 1/2πr²
..
(1/4 × 22/7 × 28²) - (1/2 × 22/7 × 14²)
616 - 308
= 308 cm²
b.
2 × (s² - 1/4πr²)
2 × (21² - (1/4 × 22/7 × 21²)
2 × (441 - (1/4 × 1386)
2 × (441 - 346,5)
2 × 94,5
= 189 cm²
[tex]\boxed{\colorbox{ccddff}{Answered by Danial Alf'at}}[/tex]
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Verified answer
Jawaban:
a. 308 cm²
b. 189 cm²
Penjelasan dengan langkah-langkah:
a.
1/4πR² - 1/2πr²
..
(1/4 × 22/7 × 28²) - (1/2 × 22/7 × 14²)
616 - 308
= 308 cm²
..
b.
2 × (s² - 1/4πr²)
2 × (21² - (1/4 × 22/7 × 21²)
2 × (441 - (1/4 × 1386)
2 × (441 - 346,5)
2 × 94,5
= 189 cm²
[tex]\boxed{\colorbox{ccddff}{Answered by Danial Alf'at}}[/tex]