body1 = EncodingUtil.base64Encode(termsandconditionsAttach.body);
body1=termsandconditionsAttach.Body.toString();

<a href="/servlet/servlet.FileDownload?file={!AttachmentId}">Download</a>

String bodyContent = myAttachment.body.toString();

public string bodyContent{get;set;}

public string getBodyContent(){
    return myAttachment.body.toString();
}