GRADE 8 MATH · CHAPTER 4
Geometry & measurement
Study each lesson in order, or choose the idea you need today.
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Geometry
Reflect a point across the x-axis
Use coordinate structure to describe a reflection across the x-axis.
Geometry & measurement
Find a right-triangle hypotenuse
Apply the Pythagorean theorem to perpendicular side lengths.
Geometry & measurement
Find a cylinder’s exact volume
Relate the volume of a right circular cylinder to its circular base area and height.
AN EXAMPLE FROM THIS CHAPTER
Reflect the point (2, 3) across the x-axis. What are the image coordinates?
Show answer & explanation
(2, -3)
The horizontal coordinate stays 2. The vertical coordinate changes from 3 to -3, so the image is (2, -3).
Curriculum & source notes
These are original Little Play study books organized around U.S. school topics. The official curriculum references below guide topic scope and progression. Coverage is selected, not a complete curriculum or a verified match to every state standard. They are not copies of a publisher’s textbook. Check your school’s syllabus and book edition.
High-school courses can be taken in different years. Choose the topic that matches the student’s current course.
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