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ertificate proves successfully passed university entrance exam. Students in classroom chalkboard background. Education concept. College entrance exam. Prepare final exam. Students study before exam.
A young European red-haired woman shows an OK-gesture with her fingers. Happy woman smiling with blue eyes. Her happy face proves that everything is going according to plan.
Geometric construction that is used to prove the theorem, two angles whose sides are perpendicular, each to each, are either equal or supplementary, vintage line drawing or engraving illustration.
Students in classroom chalkboard background. Education concept. College entrance exam. Prepare final exam. Students study before exam. ertificate proves successfully passed university entrance exam.

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