tolong jawab no. 21-22 ya! terima kasih

21)  Luas = ( 3√3 s² ) / 2
                = ( 3√3 10² ) / 2
                = ( 300√3 ) / 2
                = 150 √3 cm²

22)  diagonal = √ 4² + 3²
                      = √25
                      = 5
             
              luas = lebar kali diagonal
                      = 2 x 5
                      = 10 cm²