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Verified answer
A.Panjang Busur AB = α/360º x 2 π r80°/360° x 2πr = 2/9 x 2 x 22/7 x 21
=2/9 x 2 x 66
=2/9 x 132
=29,333..cm
=29.3 cm ( pembulatan )
b.Luas juring = 80/360 xπr²
=2/9 x 22/7 x 21²
=2/9 x 22/7 x 441
=2/9 x 1386
= 77 cm²