Mohon guidancenya🙏

<p><i><strong>diketahui</strong></i>:</p><p>CA = 6cm (jari-jari lingkaran)</p><p>AB = CA</p><p>ED + DF = 8cm</p><p>AE + AF = ED + DF (karena berbentuk persegi panjang)</p><p>bangun berbentuk ¼lingkaran</p><p><i><strong>ditanya</strong></i>: keliling bangun yang diarsir</p><p>&nbsp;</p><p><i><strong>jawab</strong></i>:&nbsp;</p><p><strong>keliling diarsir = ¼ keliling lingkaran + CA + AB - (AE + AF) + (ED + DF)</strong></p><p>keliling diarsir = (¼ × 2 × 𝞹 × r) + 6cm + 6cm - (8cm) + (8cm)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (¼ × 2 × 6 × 𝞹) + 12cm</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 3 × 𝞹 + 12cm</p><p>&nbsp;</p><p>jadi, keliling bangun yang diarsir adalah <strong>D. 3𝞹 + 12cm</strong></p>