misalkan d adalah diameter lingkaran, maka

<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell d squared end cell equals cell 20 squared minus 16 squared end cell row cell d squared end cell equals cell 400 minus 256 end cell row cell d squared end cell equals 144 row d equals 12 end table end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«msup»«mi»d«/mi»«mn»2«/mn»«/msup»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«msup»«mn»20«/mn»«mn»2«/mn»«/msup»«mo»-«/mo»«msup»«mn»16«/mn»«mn»2«/mn»«/msup»«/mtd»«/mtr»«mtr»«mtd»«msup»«mi»d«/mi»«mn»2«/mn»«/msup»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»400«/mn»«mo»-«/mo»«mn»256«/mn»«/mtd»«/mtr»«mtr»«mtd»«msup»«mi»d«/mi»«mn»2«/mn»«/msup»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»144«/mn»«/mtd»«/mtr»«mtr»«mtd»«mi»d«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»12«/mn»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" height="78" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABOCAYAAADW1bMEAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAnZS4n9QAABFhJREFUeNrtnT1oFFEQx5cgIiEEggQRC+EIFiFIQEREgggWEiSIIOEKixCwELG1ErG1sJCQNgQJQhCRYGGXwsJGQrAQCYiIXCF2FiEE4Zwn/4P1+d7u7Mf72Nv5wZDs3XA7++Z95ebPS5IU4y7ZL7LvZNeT+Ig1PmdxPSE7SjZH1oswIbHG5zyuI2QHSbzEGp+zuO6RPY04IbHGVzmum2Qb2mtXyLaQ7bpQ8+o7skP8XCUbM/hdItuB3y6mgMRxfGfIHuJ+No6joXuI7T3ZvIu4HpM90IJ7g/mwTtRnXiYbwfUy2UvNp0P2mewcrtXPPbzuMr7nZEtkfcv7quNspzqHeoarZG9dxKUa5Ubqehsf7hr1UPvaaytIVJolvO4jPltCHmEXlUXpuBYwJfQw330hO6UFlTZb4FnG4TTunUZdTxqmim8F46s7ITtaG3HahMV9sjUMwXGyZwF3KlvayFT8tvgeFmzUsp3F9v4+1otd/L5JdrZqA0yip42kXruIoeaTMWwiFgzv2RLiq9PYEqLiepWakk6SvTZ0qELcwuKVposRUybwMr3wBNkLsinL+3uGKWvSMLX5TsgPw85pguxrlZstaotjgizf8fSwE+hlExk+K1jE9UV9NXBC1rHmpRkl+1DlZlPYO4+hp24g8/Me14yZHJ/BtncW1xcwOjqBEzKNv52mUyN9A1vfSlzDOqKG2m2yn2THPD4sZ3qbw+J5iN3NXKDYdM5jvd3HSJ9NBEEQBEEQBEEQhpTYVSetI3bVSWuJXXXSOmJXnQwtvlQnaVRxyvbNKkd1wvEpA0cZw/2SlKNSMeJLdTJA1UM+WR6Cozrh+JSFo4zh1Ms5KhUrvlUnqmrZtTwYR3XC8akLkzKGkxCOSuWf6SKU6kRNCZsZD8ZRnXB86sKkjOEkhKNS+UtI1Ymaqj6i8WwPxlGdFFGmVJUrmZQxfdyrh7XXVKhiqVRCq07WsYFISiTkoKBPVbKUMQNGkayd5P9SLkulElp1wvHlqE5cK1PylDGmjq5rglkqldCqk4QxF3NUJy6VKRxljM44dn36bJCrUgmtOuEkhKM6calM4Shj1lKN3UGnXtR82CqVkKoTTkKShKc6caVM4Uyry2i3wb27ls8SlYogCIIgCIIgCI1FVCeRIaqTSBHVSWSI6iQQPlUnnDNFBmQpU4r4NA6fqpO8M0UGZClTivg0khBnnfQZievm+HF8GkEMZ51UUaZwfRpBLGed9DOmoTxlCsenEcRy1klWI3KUKRyfRhDDWSd5jcj5vCpHQkVFTKqTfo1+jR0hMalOJCEgtOqkrgPFhiYhgiAIgiAIgiAIgiA0FVOtvSp5NXXu/xhpJXqtvQ7yauqckxRai15rrxPuF4KmkxRaQ16tXW9QVzX1NKaTFFqB71o7NyFbDkdptISoteclhHOSwtBSptbucsoqepLC0BGi1p4lAyp6ksLQEaLW3s9YM2YSwVutvTUSnyz+AAZQCmopsIbuAAACUHRFWHRNYXRoTUwAPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtdGFibGUgY29sdW1uYWxpZ249InJpZ2h0IGNlbnRlciBsZWZ0IiBjb2x1bW5zcGFjaW5nPSIwcHgiPjxtdHI+PG10ZD48bXN1cD48bWk+ZDwvbWk+PG1uPjI8L21uPjwvbXN1cD48L210ZD48bXRkPjxtbz49PC9tbz48L210ZD48bXRkPjxtc3VwPjxtbj4yMDwvbW4+PG1uPjI8L21uPjwvbXN1cD48bW8+LTwvbW8+PG1zdXA+PG1uPjE2PC9tbj48bW4+MjwvbW4+PC9tc3VwPjwvbXRkPjwvbXRyPjxtdHI+PG10ZD48bXN1cD48bWk+ZDwvbWk+PG1uPjI8L21uPjwvbXN1cD48L210ZD48bXRkPjxtbz49PC9tbz48L210ZD48bXRkPjxtbj40MDA8L21uPjxtbz4tPC9tbz48bW4+MjU2PC9tbj48L210ZD48L210cj48bXRyPjxtdGQ+PG1zdXA+PG1pPmQ8L21pPjxtbj4yPC9tbj48L21zdXA+PC9tdGQ+PG10ZD48bW8+PTwvbW8+PC9tdGQ+PG10ZD48bW4+MTQ0PC9tbj48L210ZD48L210cj48bXRyPjxtdGQ+PG1pPmQ8L21pPjwvbXRkPjxtdGQ+PG1vPj08L21vPjwvbXRkPjxtdGQ+PG1uPjEyPC9tbj48L210ZD48L210cj48L210YWJsZT48L21hdGg+yt41yQAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -39px;" width="100" />

dan L adalah luas setengah lingkaran, diperoleh&nbsp;

<img align="middle" alt="undefined" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«mi»L«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»1«/mn»«mn»2«/mn»«/mfrac»«mo»§#215;«/mo»«mi»§#960;«/mi»«mo»§#215;«/mo»«msup»«mrow»«mo»(«/mo»«mfrac»«mi»d«/mi»«mn»2«/mn»«/mfrac»«mo»)«/mo»«/mrow»«mn»2«/mn»«/msup»«mo»§#160;«/mo»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»1«/mn»«mn»2«/mn»«/mfrac»«mo»§#215;«/mo»«mn»3«/mn»«mo»,«/mo»«mn»14«/mn»«mo»§#215;«/mo»«msup»«mrow»«mo»(«/mo»«mfrac»«mn»12«/mn»«mn»2«/mn»«/mfrac»«mo»)«/mo»«/mrow»«mn»2«/mn»«/msup»«mo»§#160;«/mo»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»1«/mn»«mn»2«/mn»«/mfrac»«mo»§#215;«/mo»«mn»3«/mn»«mo»,«/mo»«mn»14«/mn»«mo»§#215;«/mo»«msup»«mrow»«mo»(«/mo»«mn»6«/mn»«mo»)«/mo»«/mrow»«mn»2«/mn»«/msup»«mo»§#160;«/mo»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»1«/mn»«mn»2«/mn»«/mfrac»«mo»§#215;«/mo»«mn»3«/mn»«mo»,«/mo»«mn»14«/mn»«mo»§#215;«/mo»«mn»36«/mn»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»56«/mn»«mo»,«/mo»«mn»52«/mn»«mo»§#160;«/mo»«msup»«mtext»cm«/mtext»«mn»2«/mn»«/msup»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" height="180" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -91px;" width="142" />

&nbsp;

Tentukan luas daerah yang diarsir dari setiap gambar berikut.

a.

<img alt="" src="https://imgix2.ruangguru.com/assets/miscellaneous/png_viqrrb_8829.PNG" style="width: 264px; height: 162px;" />

&nbsp;

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Bangun Datar Gabungan

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