Download G-SRT.A.2

Mathematics Curriculum Supplement
Geometry (G-SRT.A.2)
Geometry
Mathematics
Highly-Leveraged Standard1
G-SRT.A.2 Given two figures, use the definition of similarity in terms of similarity transformations to decide if they are
similar; explain using similarity transformations the meaning of similarity for triangles as the equality of all
corresponding pairs of angles and the proportionality of all corresponding pairs of sides.
Student Learning Targets:
Students will be able to:
 explain a transformation is a similarity transformation if and only if it is the composite of dilations and an
isometric transformation.
 know if two figures are similar then corresponding angles are congruent and corresponding lengths are
proportional.
 analyze the relationship between the measures of lengths among similar triangles created with a known scale
factor.
Performance Level Descriptors
Standard
Minimally Proficient
Partially Proficient
Proficient
Highly Proficient
The Minimally
The Partially Proficient
The Proficient student
The Highly Proficient
Proficient student
student
student
Similarity, Right Triangles and Trigonometry
G-SRT.A
Identifies corresponding Determines if two given Explains that two given
Proves or disproves that
[2]
parts of two similar
figures are similar.
figures are similar in
two given figures are
figures.
terms of similarity
similar, using
transformations.
transformations and the
definitions of similarity.
1
Highly-Leveraged Standards are the most essential for students to learn because they have endurance, leverage and essentiality.
This definition for highly-leveraged standards was adapted from the website of Millis Public Schools, K-12, in Massachusetts, USA.
http://www.millis.k12.ma.us/services/curriculum_assessment/brochures
Specifically for mathematics, the Highly-Leveraged Standards are the Major Content/Clusters as defined by the AZCCRS Grade
Level Focus documents. They should encompass a range of at least 65%-75% for Major Content/Clusters and a range of 25%-35%
for Supporting Cluster Instruction. See the Grade Level Focus documents at:
https://cms.azed.gov/home/GetDocumentFile?id=57069f7baadebe0bccd0a8b5
TUSD Department of Curriculum and Instruction
Curriculum 3.0
Revised 5/2/2017 11:30 PM
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