jawabannya apa yaa..

t trapeium = d lingkran :
 alas sisi miring = 50-35 = 15 cm
t=√25²-15²
 =√625-225
 =√400
=20 cm

L = L trapesium-L 1/2 lingkaran
  =1/2(a+b) x t - 1/2πr²
  =1/2(35+50)20 - 1/2 x 3,14 x 10²
  =1/2 x85 x20-1/2 x314
  =850 -157
  =693 cm²

jawab.D