luas bidang diagonal daerah yang diarsir adalah A. 150 cm² B. 180 cm² C. 300 cm² D. 360 cm²

<p>BG² = BC² + CG²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 12² + 9² &nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 144 + 81</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 225&nbsp;</p><p>BG = √225 = 15 cm</p><p>Luas bidang diagonal = AB x BG</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 24 x 15</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 360 cm²</p><p>Jawaban : D</p>