If two triangles have the two sides equal to two sides respectively, and have also the base equal to the base, they will also have the angles equal which are contained by the equal straight lines.
SI duo triangula duo latera habuerint duobus lateribus; vtrumque vtrique æqualia, habuerint verò & basim basi æqualem: Angulum quoque sub æqualibus rectis lineis contentum angulo æqualem habebunt.