Question

Tolong yang jago matematika nomer 1 dan 2 dengan caranya yang lengkap banget

Answer 1

Verified answer

1) 3/4 keliling lingkaran = 3/4 x π d
                                      = 3/4 x 3,14 x 20
                                      = 47 cm
   
    minimal panjang tali  = 3/4 keliling lingkaran + 3 diameter lingkaran
                                      = 47 + 3 (20)
                                      = 107 cm

2) 1/4 keliling lingkaran = 1/4 x 2 π r
                                      = 1/4 x 2 x 3,14 x 12
                                      = 18,84 cm
     ada 4 pipa di pojok maka
     4 x 1/4 keliling lingkaran = 4 x 18,84
                                            = 75,36 cm
    
     minimal panjang tali = 75,36 + (8 x diameter)
                                      = 75,36 + (8 x 2 x 12 )
                                      = 267,36 cm