Question

Tolong yang jago matematika nomer 3 dengan caranya yang lengkap

Answer 1

Verified answer

AB² = PQ² - (BQ - AP)²
       = 9²    - ( 4 - 3)²
       = 81 - 1
       = 80
AB  = √80
       = 8,9 cm
AB = DC = 8,9 cm

1/2 keliling lingkaran kecil = 1/2 x 2 x π x r
                                          = 1/2 x 2 x 3,14 x 3
                                          = 9,42 cm
1/2 keliling lingkaran besar = 1/2 x 2 x π x r
                                            = 1/2 x 2 x 3.14 x 4
                                            = 12,56 cm
minimal panjang tali = 1/2 lingkaran besar + 1/2 lingkaran kecil + AB + DC
                                 = 9,42 + 12,56 + 8,9 + 8,9
                                 = 39,78 cm