Luas bangun ini?? No. 17 & 19 tolong....

17) L1 = s² = 10 × 10 = 100 cm²
L2 = ½ × a × t = ½ × 10 × 5 = 25 cm²
L yg tdk diarsir = 100 - 25 = 75 cm² (C)

19) L1 = p × l = 17 × (2 × 7) = 17 × 14 = 238
L2 = p × l = (30 - 17) × 7 = 13 × 7 = 91
L3 = ½ × π × r² = ½ × 22/7 × 7 × 7 = 11 × 7 = 77 cm
L daerah = (L1 + L2) - L3
= (238 + 91) - 77
= 329 - 77
= 252 cm² (A)

17.luas persegi = s×s
=10×10
=100cm
Luas segitiga=1/2×a×t
=1/2×10×5
=1/2×50
=25
=luas bagian yang tidak diarsir =100-25
=75 cm ( C )