Section 1
Defining a Quadrilateral
Property
A quadrilateral is a polygon with exactly four sides and four vertices.
The sum of all interior angles in any quadrilateral equals :
In this Grade 7 lesson from Big Ideas Math, Course 2, Chapter 7, students learn to classify quadrilaterals — including trapezoids, parallelograms, kites, rectangles, rhombuses, and squares — based on properties of their sides and angles. Students also apply the rule that the sum of interior angle measures of any quadrilateral equals 360° to find missing angle measures. Hands-on activities using geoboards and geometry software reinforce how these shapes are defined and related to one another.
Section 1
Defining a Quadrilateral
A quadrilateral is a polygon with exactly four sides and four vertices.
The sum of all interior angles in any quadrilateral equals :
Section 2
Types of Quadrilaterals
Think of these shapes like a family tree! A square is a special type of rectangle, which is a special type of parallelogram. Each shape inherits traits from the one above it but adds its own unique rule.
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Section 1
Defining a Quadrilateral
A quadrilateral is a polygon with exactly four sides and four vertices.
The sum of all interior angles in any quadrilateral equals :
Section 2
Types of Quadrilaterals
Think of these shapes like a family tree! A square is a special type of rectangle, which is a special type of parallelogram. Each shape inherits traits from the one above it but adds its own unique rule.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter