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<title>2.2</title>
<id>https://peda.net/id/16e0a11e1e0</id>
<updated>2019-01-22T08:22:27+02:00</updated>
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<rights type="html">&lt;div class=&quot;license&quot;&gt;Tämän sivun lisenssi &lt;a rel=&quot;license&quot; href=&quot;https://peda.net/info&quot;&gt;Peda.net-yleislisenssi&lt;/a&gt;&lt;/div&gt;&#10;</rights>

<entry>
<title>239</title>
<id>https://peda.net/id/a28416221e1</id>
<updated>2019-01-22T09:52:15+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/239#top" />
<content type="html">&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3Dab%5Csin%5Cgamma&quot; alt=&quot;A=ab\sin\gamma&quot;/&gt;</content>
<published>2019-01-22T09:52:15+02:00</published>
</entry>

<entry>
<title>237</title>
<id>https://peda.net/id/3e9d655a1e1</id>
<updated>2019-01-24T08:33:37+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/237#top" />
<content type="html">&lt;br/&gt;&#10;lasketaan pienemmän kolmion toinen sivu, jotta voidaan laskea pinta-ala kaavalla &lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7Dab%5Csin%5Calpha&quot; alt=&quot;A=\frac{1}{2}ab\sin\alpha&quot;/&gt; &lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Cfrac%7B24%7D%7Bx%7D%3D%5Cfrac%7B36%7D%7B17%7D&quot; alt=&quot;\frac{24}{x}=\frac{36}{17}&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=36x%3D408%5C%20%5Cparallel%3A36&quot; alt=&quot;36x=408\ \parallel:36&quot;/&gt;&lt;br/&gt;&#10;&lt;div&gt;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=x%3D11%5C%20%5Cfrac%7B1%7D%7B3%7D&quot; alt=&quot;x=11\ \frac{1}{3}&quot;/&gt;&lt;/div&gt;&#10;&lt;div&gt; &lt;/div&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7D%5Ccdot24%5Ccdot11%5C%20%5Cfrac%7B1%7D%7B3%7D%5Ccdot%5Csin45%C2%B0%3D68%5Csqrt%7B2%7D&quot; alt=&quot;A=\frac{1}{2}\cdot24\cdot11\ \frac{1}{3}\cdot\sin45°=68\sqrt{2}&quot;/&gt;</content>
<published>2019-01-22T09:49:27+02:00</published>
</entry>

<entry>
<title>236</title>
<id>https://peda.net/id/3c4ba7861e1</id>
<updated>2019-01-22T09:42:14+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/236#top" />
<content type="html">a) kyllä, kulma alfa ja sen suplementtikulma&lt;br/&gt;&#10;b) epätosi, sivujen välinen kulma voi olla joko sama kuin vertailtavassa kolmiossa, tai sen suplementtikulma&lt;br/&gt;&#10;c) epätosi, kaavalla &lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7Dab%5Csin%5Calpha&quot; alt=&quot;A=\frac{1}{2}ab\sin\alpha&quot;/&gt; saadaan pinta-alaksi vain yksi arvo</content>
<published>2019-01-22T09:42:14+02:00</published>
</entry>

<entry>
<title>231</title>
<id>https://peda.net/id/a95141e81e1</id>
<updated>2019-01-22T09:38:08+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/231#top" />
<content type="html">kolmioiden pinta-alat ovat yhtä suuret, sillä 130 ja 50 ovat toistensa suplementtikulmia. Niiden sinit ovat yhtä suuret. Koska kulmien viereiset sivut ovat yhtä pitkiä, kaavalla &lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7Dab%5Csin%5Calpha&quot; alt=&quot;A=\frac{1}{2}ab\sin\alpha&quot;/&gt; saadaan sama pinta-ala molemmille kolmioille</content>
<published>2019-01-22T09:38:07+02:00</published>
</entry>

<entry>
<title>229</title>
<id>https://peda.net/id/4bcbeae61e1</id>
<updated>2019-01-22T09:35:31+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/2292#top" />
<content type="html">A 1 2&lt;br/&gt;&#10;B -&lt;br/&gt;&#10;C 1&lt;br/&gt;&#10;D 2</content>
<published>2019-01-22T09:35:31+02:00</published>
</entry>

<entry>
<title>229</title>
<id>https://peda.net/id/49fa78c21e1</id>
<updated>2019-01-22T09:35:28+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/229#top" />
<content type="html">A 1 2&lt;br/&gt;&#10;B -&lt;br/&gt;&#10;C 1&lt;br/&gt;&#10;D 2</content>
<published>2019-01-22T09:35:28+02:00</published>
</entry>

<entry>
<title>230</title>
<id>https://peda.net/id/01a1c18e1e1</id>
<updated>2019-01-22T09:33:26+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/230#top" />
<content type="html">a)&lt;br/&gt;&#10;&lt;b&gt;&lt;/b&gt;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7Dab%5Csin%5Calpha&quot; alt=&quot;A=\frac{1}{2}ab\sin\alpha&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Calpha%3D180%C2%B0-47%C2%B0-71%C2%B0%3D62%C2%B0&quot; alt=&quot;\alpha=180°-47°-71°=62°&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7D%5Ccdot12%7B%2C%7D5cm%5Ccdot9%7B%2C%7D7cm%5Ccdot0%7B%2C%7D8829...%3D53%7B%2C%7D528...cm%5E2%5Capprox53%7B%2C%7D5cm%5E2&quot; alt=&quot;A=\frac{1}{2}\cdot12{,}5cm\cdot9{,}7cm\cdot0{,}8829...=53{,}528...cm^2\approx53{,}5cm^2&quot;/&gt;&lt;br/&gt;&#10;b) &lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7Dab%5Csin%5Calpha&quot; alt=&quot;A=\frac{1}{2}ab\sin\alpha&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Calpha%3D%5Cfrac%7B180%C2%B0%7D%7B3%7D%3D60%C2%B0&quot; alt=&quot;\alpha=\frac{180°}{3}=60°&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=A%3D%5Cfrac%7B1%7D%7B2%7D%5Ccdot7%7B%2C%7D4cm%5Ccdot7%7B%2C%7D4cm%5Ccdot%5Csin60%C2%B0%3D23%7B%2C%7D711...cm%5E2%5Capprox23%7B%2C%7D7cm%5E2&quot; alt=&quot;A=\frac{1}{2}\cdot7{,}4cm\cdot7{,}4cm\cdot\sin60°=23{,}711...cm^2\approx23{,}7cm^2&quot;/&gt;&lt;br/&gt;&#10;&lt;br/&gt;&#10;</content>
<published>2019-01-22T09:33:26+02:00</published>
</entry>

<entry>
<title>223</title>
<id>https://peda.net/id/515671581e1</id>
<updated>2019-01-22T09:28:30+02:00</updated>
<link href="https://peda.net/p/oskari.lahtinen/maa3p/2-2/223#top" />
<content type="html">a)&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Cleft(0.6%7B%2C%7D%5C%200.8%5Cright)&quot; alt=&quot;\left(0.6{,}\ 0.8\right)&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Csin53%C2%B0%3D0%7B%2C%7D7986...%5Capprox0%7B%2C%7D8&quot; alt=&quot;\sin53°=0{,}7986...\approx0{,}8&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Ccos53%C2%B0%3D0%7B%2C%7D6018...%5Capprox0%7B%2C%7D6&quot; alt=&quot;\cos53°=0{,}6018...\approx0{,}6&quot;/&gt;&lt;br/&gt;&#10;b)&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Cleft(-0.8%7B%2C%7D%5C%200.6%5Cright)&quot; alt=&quot;\left(-0.8{,}\ 0.6\right)&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Csin143%C2%B0%3D0%7B%2C%7D6018...%5Capprox0%7B%2C%7D6&quot; alt=&quot;\sin143°=0{,}6018...\approx0{,}6&quot;/&gt;&lt;br/&gt;&#10;&lt;img src=&quot;https://math-demo.abitti.fi/math.svg?latex=%5Ccos143%C2%B0%3D-0%7B%2C%7D7986%5Capprox-0%7B%2C%7D8&quot; alt=&quot;\cos143°=-0{,}7986\approx-0{,}8&quot;/&gt;&lt;br/&gt;&#10;</content>
<published>2019-01-22T09:28:30+02:00</published>
</entry>


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