tolong no 18 luas bagunan yg diarsir

L 1/2 lingkaran=1/2×phi×r×r
=1/2×22/7×7×7
=77 cm2

L trapesium=1/2×jumlah sisi sejajar×tinggi
=1/2×(20+14)×7
=1/2×34×7
=119 cm2

L arsir=119-77
=42 cm2(A)