luas bangun diatas ....cm²

L = phi × r^2 ÷ 2

= 22/7 × 14^2 ÷ 2

= 22/7 × 196 ÷ 2

= 22 × 28 ÷ 2

= 11 × 28

= 308

luas, stengah linkaran 22/7×14×14 ÷ 2 = 616÷ 2 = 308
14 didapat dari diameter : 2 = 28 : 2 = 14.