Your TV must have an HDMI connector. Please check if your home theater also has an HDMI connector - like this one:
If so, then all you need to do is buy an HDMI cable, and connect one end to your home theater, and the other to your TV. HDMI cables have a digital connection that carries both audio and video, so they are quite convenient. Don't forget to select the HDMI input using your TV's remote control.
Tip: HDMI uses a digital transmission scheme which is fairly robust (unlike analog transmissions), so a $5 HDMI cable will perform just as good as a $50 or $100 HDMI cable. Don't let those store clerks rip you off.
If your home theater does not have an HDMI output, then you must use the analog connections. Look at the back of your home theater and make note of the connectors labeled as 'Output' (both audio and video). You should buy cables with connectors matching those connections.
If you need more clarification on this subject, just ask.
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