Jawab in.........................

14)  Luas 1/4 lingkaran = 1/4 x π x r²
                                      = 1/4 x 22/7 x 14 x 14
                                      = 22 x 7
                                      = 154 cm²

       Luas Segitiga         =  1/2 x a x t
                                      =  1/2 x 14 x 14
                                      = 98 cm²

       Luas tembereng     = 154 - 98
                                      = 56 cm²  (A)

15) Besar setiap sudut = 360° / 8
                                     = 45°  (B)

16) Karena menghadap busur yang sama yaitu PR dan O adalah titik pusat
      lingkaran maka
      ∠POR = 2 x ∠PSR
                 = 2 x 56° 
                 = 112°  (C)

17) Jumlah sudut segitiga = 180°
                   90° + 44° + x° = 180°
                          134° + x° = 180°
                                      x° = 180° - 134°
                                          = 46° (B)

Semoga membantu