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maaf kak fotonya gak jelas

Dik
luas juring OAB = 50 cm2 dgn sudut 75'

jawab
sudut POQ = 60 berarti sudut BOP = 180 - (75+60) = 180-135 = 45'

b) luas juring OAB = 50 cm2
         sudut x pi x r2 = 50cm
          75/360 x 22/7 x r2 = 50
                           r2 = 50 x 360 x7
                                 ---------- = 76,36 cm
                                  75 x 22
                           r = V76 cm

a) Luas juring POQ = sudut x pi x r2
                = 60/360 x 22/7 x r2
                = 1/6 x 22/7 x 76,36 = 39,9 -> dibulatin 40 cm2

c) Luas lingkaran = pi x r2 = 22/7 x 76,36 = 239,99 cm2