iRubric: Geometic Proofs of Similar Triangles rubric

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Geometic Proofs of Similar Triangles

Students present formal and informal arguments as to whether two triangles are similar. Students practice finding lengths of corresponding sides of similar triangles using math tools and geometry theorems

Rubric Code: XX7X9A4

By logan219

Ready to use

Public Rubric

Subject: Math

Type: Project

Grade Levels: 6-8

Task and Description Students determine if two triangles are similar by applying FTS, and strategies of similar measures
	Below Standards 25 pts	Approaching Standards 25 pts	Meeting Standards 25 pts	Exceeding Standards 25 pts
Measuring to prove corresponding se 25 pts Students will set-up ratios to determine if two triangles have a dilated relationship	Below Standards Identifying the corresponding sides has been computed incorrectly Determining the set-up of the correct ratio.	Approaching Standards Most of the elements are present in the graph. Math tools were used and the scale of measure is incorrect.	Meeting Standards All graphs are adequate, clean and neat.	Exceeding Standards All constructed figures are clean aand neat
Use of a Protractor to measure ang 20 pts Students can demonstrate that they can use a protractor to determine the correct angle and record the measures of triangles	Below Standards Measurement using a protractor is lacking by 7 points or more for each angle. The length of each side is calculating incorrectly due to an error in determining the distance of two points.	Approaching Standards Student can mention the equivalent ratios for side lengths, but fail to discuss the measure of an angle.	Meeting Standards Students realize hat dilated figures have equivalent ratios.	Exceeding Standards All criteria of the task has been met. The graph is neat, clean, and is a perfect learning toool to visualize similarity
Labeling Figures 20 pts Students will place all the appropriate labels and evaluate ratios to arrive at a scale factor that supports dilation and FTS, congruency and similarity.	Below Standards Students fail to mention a relationship between the two figures that is proportional and similar in measure	Approaching Standards Students understand the criteria and logical reasoning behind placing labels on diagrams but omits at least two or more labels and or geometry symbols.	Meeting Standards The written explanation and ratios written to prove similarity are clear and concise and demonstrate knowledge of dilation.	Exceeding Standards The student has demonstrated that their knowledge exceeds all the elements in the task.
Writing Proof and Summary 35 pts Students will write about relationships that prove that two triangles are dilate at a Center. Students will use all the vocabulary terms to prove A-A criterion and S-S-S theorem proof to justify arguments.	Below Standards Analysis lacks an introduction and an appropriate approach that leads to a conclusive theory. Use of Vocabulary is not sufficient to support mastery of the language.	Approaching Standards Written Analysis is adequate but is missing important facts that allow the student to make the connections.	Meeting Standards Analytical writing is complete and concise and all math connections lead to supporting details to demonstrate a thorough understanding of similarity , dilation and proofs.	Exceeding Standards Analytical writing is complete and concise and all math connections lead to supporting details to demonstrate a thorough understanding of similarity , dilation and proofs.An additional example is provided in contrast of

Keywords:

FTS, Congruence, Ratio and Proportionality,Angle measures, Corresponding Sides, Similarity

Subjects:

Math

Types:

Project

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