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360
22 = α x (2.π.r)
360
22 x 360 = α x (2.22/7.7)
7920 = α x 44
α = 7920/44 = 180 derajat.
l.juring = α x l.lingkaran
360
= 180 x (π.r²)
360
= 1 x (22/7.7.7)
2
= 1 x 154
2
= 77 cm^2
p. busur / l juring = 2/ r
22 / l juring = 2/7
l juring = 22 × 7/2
l juring = 77 cm