jawaban:
18.c.busur lingkaran
19.d.garis cf = apotema
20.88cm
Penjelasan dengan langkah-langkah:
20.L.=π×r²
616=22/7×r²
616×7/22=r²
4312/7=r²
196=r²
r=√196=14cm
K=π×d
=22/7×28
=22×4
=88cm
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jawaban:
18.c.busur lingkaran
19.d.garis cf = apotema
20.88cm
Penjelasan dengan langkah-langkah:
20.L.=π×r²
616=22/7×r²
616×7/22=r²
4312/7=r²
196=r²
r=√196=14cm
K=π×d
=22/7×28
=22×4
=88cm