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Hyperbolic Geometry 'Lupis': Hypothetical Learning Trajectory of the Triangle in the Context of Sumatra

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Title: Hyperbolic Geometry 'Lupis': Hypothetical Learning Trajectory of the Triangle in the Context of Sumatra
Language: English
Authors: Scolastika Mariani (ORCID 0009-0005-9630-8695), Abdurrobbil Falaq Dwi Anggoro (ORCID 0000-0001-8927-5964), Wardono (ORCID 0009-0005-1039-4538), Bambang Eko Susilo (ORCID 0000-0001-9008-3265)
Source: European Journal of STEM Education. 2026 11(1).
Availability: Lectito Journals. Wassenaarseweb 20, 2596 CH, The Hague, The Netherlands. Tel: 31-70-2190600; e-mail: info@lectitojournals.com; Web site: http://www.lectitopublishing.nl
Peer Reviewed: Y
Page Count: 15
Publication Date: 2026
Document Type: Journal Articles
Reports - Research
Education Level: Higher Education
Postsecondary Education
Descriptors: Geometry, Geometric Concepts, Learning Trajectories, Foreign Countries, Culturally Relevant Education, Undergraduate Students, Mathematics Instruction, Instructional Effectiveness
Geographic Terms: Indonesia
ISSN: 2468-1954
2468-4368
Abstract: Lobachevsky geometry is an elective course that is difficult for students to learn. One of them is the concept of the number of angles in a triangle less than 180 degrees. The purpose of this study is to produce a design of a Triangle learning trajectory in Lobachevsky Geometry using the context of the Sumatran traditional snack "lupis cake". The subject of this study is a mathematics education student at one of the universities in Bengkulu province. The research approach used in this study is Design Research. This approach involves an iterative cycle consisting of three phases, namely the preparation phase, the experimental phase, and the retrospective analysis phase. The result of this study is that there are five activities in the learning trajectory of the Triangle in Lobachevsky Geometry using the context of Sumatran traditional snack "lupis cake". Using this context, students are able to find the concept of the number of angles on a triangle less than 180 degrees. The conclusion is that the design of the Triangle learning trajectory in Lobachevsky's Geometry in the context of the traditional Sumatran snack "lupis cake" is valid and practical for finding the number of angles in a triangle.
Abstractor: As Provided
Entry Date: 2026
Accession Number: EJ1504744
Database: ERIC
FullText Text:
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  Data: Hyperbolic Geometry 'Lupis': Hypothetical Learning Trajectory of the Triangle in the Context of Sumatra
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  Data: <searchLink fieldCode="AR" term="%22Scolastika+Mariani%22">Scolastika Mariani</searchLink> (ORCID <externalLink term="https://orcid.org/0009-0005-9630-8695">0009-0005-9630-8695</externalLink>)<br /><searchLink fieldCode="AR" term="%22Abdurrobbil+Falaq+Dwi+Anggoro%22">Abdurrobbil Falaq Dwi Anggoro</searchLink> (ORCID <externalLink term="https://orcid.org/0000-0001-8927-5964">0000-0001-8927-5964</externalLink>)<br /><searchLink fieldCode="AR" term="%22Wardono%22">Wardono</searchLink> (ORCID <externalLink term="https://orcid.org/0009-0005-1039-4538">0009-0005-1039-4538</externalLink>)<br /><searchLink fieldCode="AR" term="%22Bambang+Eko+Susilo%22">Bambang Eko Susilo</searchLink> (ORCID <externalLink term="https://orcid.org/0000-0001-9008-3265">0000-0001-9008-3265</externalLink>)
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  Data: <searchLink fieldCode="SO" term="%22European+Journal+of+STEM+Education%22"><i>European Journal of STEM Education</i></searchLink>. 2026 11(1).
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  Data: Lectito Journals. Wassenaarseweb 20, 2596 CH, The Hague, The Netherlands. Tel: 31-70-2190600; e-mail: info@lectitojournals.com; Web site: http://www.lectitopublishing.nl
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  Data: <searchLink fieldCode="DE" term="%22Geometry%22">Geometry</searchLink><br /><searchLink fieldCode="DE" term="%22Geometric+Concepts%22">Geometric Concepts</searchLink><br /><searchLink fieldCode="DE" term="%22Learning+Trajectories%22">Learning Trajectories</searchLink><br /><searchLink fieldCode="DE" term="%22Foreign+Countries%22">Foreign Countries</searchLink><br /><searchLink fieldCode="DE" term="%22Culturally+Relevant+Education%22">Culturally Relevant Education</searchLink><br /><searchLink fieldCode="DE" term="%22Undergraduate+Students%22">Undergraduate Students</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematics+Instruction%22">Mathematics Instruction</searchLink><br /><searchLink fieldCode="DE" term="%22Instructional+Effectiveness%22">Instructional Effectiveness</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Indonesia%22">Indonesia</searchLink>
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  Data: 2468-1954<br />2468-4368
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  Data: Lobachevsky geometry is an elective course that is difficult for students to learn. One of them is the concept of the number of angles in a triangle less than 180 degrees. The purpose of this study is to produce a design of a Triangle learning trajectory in Lobachevsky Geometry using the context of the Sumatran traditional snack "lupis cake". The subject of this study is a mathematics education student at one of the universities in Bengkulu province. The research approach used in this study is Design Research. This approach involves an iterative cycle consisting of three phases, namely the preparation phase, the experimental phase, and the retrospective analysis phase. The result of this study is that there are five activities in the learning trajectory of the Triangle in Lobachevsky Geometry using the context of Sumatran traditional snack "lupis cake". Using this context, students are able to find the concept of the number of angles on a triangle less than 180 degrees. The conclusion is that the design of the Triangle learning trajectory in Lobachevsky's Geometry in the context of the traditional Sumatran snack "lupis cake" is valid and practical for finding the number of angles in a triangle.
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      – Text: English
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      Pagination:
        PageCount: 15
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      – SubjectFull: Learning Trajectories
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      – SubjectFull: Foreign Countries
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      – SubjectFull: Culturally Relevant Education
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      – SubjectFull: Undergraduate Students
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      – SubjectFull: Instructional Effectiveness
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      – SubjectFull: Indonesia
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      – TitleFull: Hyperbolic Geometry 'Lupis': Hypothetical Learning Trajectory of the Triangle in the Context of Sumatra
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