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Geometry (8.G)
Big Ideas:
Students use ideas about distance and angles, how they behave under translations, rotations,
reflections, and dilations, and ideas about congruence and similarity to describe and analyze twodimensional figures and to solve problems. Students show that the sum of the angle in a triangle is
the angle formed by a straight line, and that various configurations of lines give rise to similar
triangles because of the angles created when a transversal cuts parallel lines. Students understand
the statement of the Pythagorean Theorem holds, for example, by decomposing a square in two
different ways. They apply the Pythagorean Theorem to find distances between points on the
coordinate plane, to find lengths, and to analyze polygons. Students complete their work on volume
by solving problems involving cones, cylinders, and spheres.
Overview (Big Ideas), Enduring Understandings, Essential Questions, Common
HCPSS Curriculum Framework Grade 8 Unit 4.docx
8.G.A.5. Use informal arguments to establish facts about the angle sum and exterior
angle of triangles, about the angles created when parallel lines are cut by a transversal,
and the angle-angle criterion for similarity of triangles. For example, arrange three copies
of the same triangle so that the sum of the three angles appears to form a line, and give
an argument in terms of transversals why this is so.
Web Resources:
This link has illustrations that link to tasks to support standard 8.G.5. Simply click on Geometry, 8th
grade, then on the illustrations link.
This link allows students to manipulate a polygon and observe the relationships between the sum
of exterior angles