[tex] r = \frac{d}{2} = \frac{20 \: cm}{2} = 10 \: cm \\ \\ Luas \: permukaan \: kue \\ \frac{ \alpha }{360} \times \pi \times r \times r \\ \\ \frac{45}{360} \times 3,14 \times 10 \: cm \times 10 \: cm \\ \\ 39,25 \: {cm}^{2} \: (b)[/tex]
LPK :
= 45/360(3,14(20/10)²
= 45/360(3,14(10)²
= 45/360(31,4(10)
= 45/360(314)
= 45(314)/360
= 14.130/360
= 39,25 CM²
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Verified answer
[tex] r = \frac{d}{2} = \frac{20 \: cm}{2} = 10 \: cm \\ \\ Luas \: permukaan \: kue \\ \frac{ \alpha }{360} \times \pi \times r \times r \\ \\ \frac{45}{360} \times 3,14 \times 10 \: cm \times 10 \: cm \\ \\ 39,25 \: {cm}^{2} \: (b)[/tex]
LPK :
= 45/360(3,14(20/10)²
= 45/360(3,14(10)²
= 45/360(31,4(10)
= 45/360(314)
= 45(314)/360
= 14.130/360
= 39,25 CM²