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= 72/360 x π . r²
= 72/360 x 3,14 . 25²
= 72/360 x 3,14 . 625
= 1 / 5 x 1962,5
= 392,5 mm²
= 39,25 cm²
2. luas juring = .... / 360 x π r²
231 = .../360 x 22/7 . 21²
231 = .../360 x 1386
231 = ... x 3,85
... = 231 : 3,85
.... = 60
besar sudut = 60°