no 4 apa ya? satu aja

1. Luas segitiga = 1/2.a.t
= 1/2.56.42
= 56.21
= 1176 cm2
2. Luas setengah lingkaran =
= 1/2.phi.rkuadrat
= 1/2.22/7.21.21
= 33.21
= 693 cm2
3. Ls+Ll = 1176+693
= 1869 cm2 (d)

4. L.Gabungan = ( L.Segitiga ) + ( L.½Lingkaran )
= ( ½ × a × t ) + ( ½ × π × r² )
= ( ½ × 56 × 42 ) + ( ½ × 22/7 × 21² )
= ( ½ × 2352 ) + ( ½ × 1386 )
= 1176 + 693
= 1.869 cm²

Semoga Membantu :)
``»•^°Mystic°^•«``