Dykes Paving & Construction Company, Inc. (Dykes) entered into a contract with Spicewood, Inc. whereby Dykes agreed to furnish all labor, equipment, and material to perform certain work described as asphalt paving, curb and gutter, clearing, grading, erosion control, sanitary sewer, storm sewer, and waterline installation for a construction project. Dykes then contracted with Ferro Grading Company, Inc., to do a portion of the work it had contracted for with Spicewood, Inc. Ferro Grading Company, Inc., in turn contracted some of its *398work to Ferro Pipeline Company, Inc.
A dispute arose between Dykes and Spicewood, Inc. as to the proper performance of their contract resulting in Spicewood, Inc., declaring its contract with Dykes breached and informing Dykes that it would make arrangements to complete the contract.
Subsequently, Ferro Grading Company, Inc. sued Dykes on their contract and Dykes filed its answer and counterclaim. Spicewood, Inc. then intervened as a defendant filing its answer, counterclaim and cross-claim. Dykes added its cross-claim against Spicewood, Inc. Following a jury trial a verdict was returned in favor of Ferro Grading Company, Inc. against Dykes on both its claim and Dykes’ counterclaim. As to Dykes’ cross-claim against Spicewood, Inc. the jury returned an award of “$63,379.63 with interest to be awarded on $58,756.85 . . .” from a specified date. On Spicewood, Inc.’s cross-claim against Dykes a verdict in favor of Dykes was returned.
Spicewood, Inc. moved for a new trial on several grounds including that the trial court erred in submitting to the jury documentary evidence that had not been admitted into evidence by the trial court. Spicewood Inc.’s motion for new trial was denied and this appeal followed. Held:
1. On appeal Spicewood, Inc. again contends the trial court erred in submitting to the jury documentary evidence that had not been admitted into evidence by the trial court. Dykes does not deny that the exhibits at issue were submitted to the jury but contends that they were tendered and admitted without objection. However, we may not rely on these assertions contained in the briefs of the parties but must look to the record sent up by the clerk of the trial court to determine if there is harmful error. Desai v. Safeco Ins. Co., 173 Ga. App. 815, 817 (328 SE2d 376); Continental Ins. Co. v. Carter, 171 Ga. App. 162 (318 SE2d 770); Howard v. Estate of Howard, 176 Ga. App. 86, 88 (335 SE2d 171).
In the transcript of the trial, Dykes’ Exhibit No. 30 is identified as a bill prepared by Dykes and sent to Spicewood, Inc. after Dykes was told to leave the job. The complete transcript of the trial does not suggest that this exhibit was tendered or admitted into evidence. On page three of this bill appears a list of items billed which are collectively identified as “Extra work requested by Ferro Pipeline” and which are added together to provide a total of $4,622.78.
Spicewood, Inc. points out that this number ($4,622.78) does not appear in the record other than on Exhibit 30. Spicewood, Inc. also points out that the record does not contain the amount of $58,756.85 which was awarded as liquidated damages, yet that amount of liquidated damages is the remainder when the referenced amount from Dykes’ Exhibit 30 is subtracted from the amount awarded of $63,379.63. As our examination of the record, other than Dykes’ Ex*399hibit 30, does not disclose evidence suggesting a verdict for liquidated damages in the amount returned by the jury and the low probability of a coincidence (the probability of the jury randomly selecting an identical six digit number is one in a million) we conclude that the record supports Spicewood, Inc.’s assertion that Dykes’ Exhibit 30 was utilized by the jury in reaching their verdict. At the same time we find no corroboration of Dykes’ assertion that its Exhibit 30 was tendered and admitted.
Documents upon which a party rests his case must be offered into evidence. It is error to permit the trier of fact to consider documents which have not been tendered or admitted into evidence. Stanley v. Stanley, 138 Ga. App. 560 (226 SE2d 800). We reject Dykes’ argument that any error was harmless as the erroneously considered evidence was incorporated into and is reflected in the jury’s verdict. Thus, the trial court erred in denying Spicewood, Inc.’s motion for new trial and enumerations 1 and 4 are meritorious.
2. In view of our holding in Division 1, enumerations of error 2, 3 and 5 are moot.
3. Enumerations of error 6, 7 and 8 contend error in the trial court’s sustaining objections to questions propounded by Spicewood, Inc. to its expert witness. The objections sustained at trial address the proper form of a hypothetical question or attempts to elicit testimony as to the ultimate issue to be determined by the jury. On appeal Spicewood, Inc. appears to suggest that it was required to examine the expert witness only through the use of hypothetical questions and that the expert witness was not allowed to testify on the basis of facts he had observed. Thus, the factual predicate of Spicewood, Inc.’s argument on these enumerations does not appear in the record. These enumerations of error are without merit.
4. Spicewood, Inc.’s remaining enumerations of error (9, 10, 11, 12,13) involve the trial court’s refusal to give all or portions of certain requested charges to the jury. In each instance the requested charge or portion thereof was properly refused because the principle involved was substantially covered in the court’s general charge, the requested language was not adjusted to the evidence, or the requested language was argumentative. See Turner v. Malone, 176 Ga. App. 132 (1), 133 (335 SE2d 404).
Judgment reversed.
Birdsong, C. J., Banke, P. J., Carley, Sognier, Pope and Benham, JJ., concur. Deen, P. J., concurs specially. Beasley, J., concurs in part and dissents in part.