Tavi - Ganatleba
Tavi - Ganatleba
Tavi - Ganatleba
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§4<br />
proporciuli monakveTebi msgavs samkuTxedebSi<br />
(jgufuri mecadineoba)<br />
1<br />
2<br />
3<br />
4<br />
5<br />
daasabuTeT, rom Tu ΔABC~ΔA 1 B 1 C 1 , maSin<br />
a<br />
a<br />
I <strong>Tavi</strong><br />
erTi samkuTxedis gverdebis sigrZeebi samjer metia meore samkuTxedis<br />
gverdebis sigrZeebze. ipoveT patara samkuTxedze Semoxazuli<br />
wrewiris radiusis sigrZe, Tu did samkuTxedze Semoxazuli wrewiris<br />
radiusi 15 sm-ia.<br />
msgavsi samkuTxedebze Semoxazuli wrewirebis radiusebis sigrZeebis<br />
Sefardebaa 1,5. ipoveT am samkuTxedebis perimetrebis Sefardeba.<br />
ABC samkuTxedSi Caxazuli wrewiris radiusia 5 sm-ia. ipoveT mis msgavs<br />
A 1 B 1 C 1 samkuTxedSi Caxazuli wrewiris radiusi, Tu AB:A 1 B 1 = 0:7.<br />
Tu ABC da A B C samkuTxedebi msgavsia, r da r Sesabamisad maTSi Caxa-<br />
1 1 1 1<br />
zuli wrewirebis radiusebia, maSin WeSmaritia:<br />
PABC<br />
r1<br />
PABC r<br />
a) = ; b) = ;<br />
P r<br />
r1 A1B1C<br />
1<br />
b<br />
b<br />
c<br />
c<br />
m<br />
a l a ha<br />
= = = = = = = =<br />
m l h r R<br />
1 1 1 a1<br />
a1<br />
a1<br />
1 1<br />
da amoxseniT amocanebi:<br />
PA 1B1C<br />
1<br />
g) r – r 1 = P ABC – PA<br />
1B1C ; d) r + PABC = r1<br />
+ PA B C .<br />
1 1 1 1<br />
B C<br />
M<br />
F<br />
E<br />
A D<br />
r<br />
R<br />
moc: ABCD kvadrati.<br />
BF=FA, AE=EC.<br />
EM||AB. S ∆EMC = sm .<br />
u.v. EM.<br />
P<br />
P<br />
1<br />
9