tolong kerjakan no.2 dan 3

2. K = 14 + 8 + 20 + 10
= 52
L1= p × l
= 14 × 8
= 112 cm²
L2= 1/2 × a × t
= 1/2 × 6 × 8
= 24 cm²
L = L1 + L2
= 112 cm² + 24 cm²
= 136 cm²
Maaf hanya bisa no 2

1.  L1 = 1/2 x a x t
          = 1/2 x 6 x 8
          = 24
    
     L2 = P x L
          = 14 x 8
          = 112

luas bangun = L1 + L2
                     = 24 + 112 = 136 cm²


2. L1 = P x L
         = 30 x 21
         = 630

   L2 = 1/2 x [tex] \pi [/tex]r²
        = 1/2 x 3,14 x 10,5²
        = 1/2 x 346,185
        = 173,0925

luas = L1 - L2
       = 630 - 173,0925
       = 456, 9075 cm²

keliling;
 K1 = 2 ( p + l )
      = 2 ( 30 + 21 )
      = 102 cm

K2 = 1/2 x 2[tex] \pi [/tex]r
     = 1/2 x 2 x 3,14 x 10,5
     =  32,97

K bangun  = K1 - K2
                 = 102 - 32,97
                 = 69,03 cm