Area of the sector = 35/360 x π(80)² = 1954.769m²
Area of the triangle = 1/2 (80)(80) sin(35) = 1835.445m²
Area of the shaded part = 1954.769 - 1835.445 = 119m² (3 s.f.)
Area of the sector = 40/360 x π(8)² = 22.340 cm²
Area of the triangle = 1/2 (8)(8) sin(40) = 20.569 cm²
Area of the shaded part = 22.340 - 20.569 = 1.77 cm² (3 s.f.)
