Jawaban:
keliling setengah lingkaran:
1/2×2×22/7×10,5=
22/7×10,5=
33 cm
keliling seluruhnya:
(21-10,5+33)+21+(21-10,5+33)+21=
43,5+21+43,5+21=
129 cm
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Jawaban:
keliling setengah lingkaran:
1/2×2×22/7×10,5=
22/7×10,5=
33 cm
keliling seluruhnya:
(21-10,5+33)+21+(21-10,5+33)+21=
43,5+21+43,5+21=
129 cm