Question

Me ajudem por favor , preciso da conta montada

Answer 1

Salete,
Ajudo com a primeira

a)
            Area do losango = (D x d) /2
                      D = 12
                       d = 4√7
                               as diagonais se cortam em angulo reto
                               forma 4 triângulos retos iguais onde
                                         D/2 = cateto
                                         d/2 = cateto 
                                             l = hipotenusa
                               então
                                            cateto 1 = 12/2 = 6
                                            cateto 2 = d/2
                                            hipotenusa = 8
                                                  8^2 = 6^2 + (d/2)^2
                                                   64 = 36 + d^2/4
                                                   (64 - 36)x4 = d^2
                                                        d^2 = 112
                                                          d = √112
                                                          d = 4√7
          A = (12 x 4√7)/2
                                      A = 24√7 cm²