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Penyelesaian:<br />
s = ½ (a + b + c) = ½ (10 + 6 + 8) = 12.<br />
• Jari-jari lingkaran dalam:<br />
r =<br />
s(<br />
s − a)(<br />
s − b)(<br />
s −<br />
s<br />
c)<br />
=<br />
• Jari-jari lingkaran luar:<br />
r<br />
=<br />
4<br />
abc<br />
s(<br />
s − a)(<br />
s − b)(<br />
s − c)<br />
=<br />
4<br />
12(<br />
12<br />
−<br />
12(<br />
12<br />
10)(<br />
12<br />
−<br />
12<br />
−<br />
( 10)(<br />
6)(<br />
8)<br />
10)(<br />
12<br />
−<br />
6)(<br />
12<br />
6)(<br />
12<br />
−<br />
−<br />
8)<br />
8)<br />
=<br />
=<br />
2<br />
5
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