tolong yaa, pakai caraa..... dikumpul besok ni..

1. L= 1/2 × a×t                L=1/2 × π × r²
      = 1/2 × 18 × 10           = 1/2 × 3,14×9×9
      = 90 cm²         +            = 127,17cm²
      = 217,17 cm²

2. L=p×l                    L=1/2 ×π ×r²
      =14×13                = 1/2 ×22/7××7××7
      =168 cm²      +       =77cm²
      = 245 cm²

3.L=1/2 ×π×r²              L=1/2×(a+b)×t           L=1/2×π×r²
     = 1/2 ×3,14×4×4       =1/2×(20 +8)×6         =1/2×3,14×10×10
      =25,12 cm²        +      =84cm²         =           = 157 cm²        = 266,12 cm²