Seventh Grade - MATH
5: Math
Unit 6: 2D Geometry
Lesson 3
Triangles
Students are instructed step-by-step to construct triangles with a ruler and protractor (Activity 2: Draw a 6 cm side and 40° and 65° angles) and to compute the third angle. Students use technology tools (GeoGebra 'Triangle Maker' and MathIsFun interactives) to explore forming triangles and to test conditions. Students draw triangles on a coordinate grid and with given side lengths and angles (Activities 3 and Drawing Triangles: Part 1/2) and classify examples as unique, non-unique, or impossible.
Lesson 7
Unit 6 Test
The Parent Plan explicitly lists the skill: "Draw geometric shapes with given conditions using a ruler and protractor" and it names the focus: "constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle." Student activities ask students to draw triangles with given measures (e.g., draw a triangle with sides 5 cm and 3 cm and a 65° included angle; draw a triangle with base 4 cm and angles 100° and 40°) and to use grids to draw specified triangle types (obtuse scalene, right isosceles). The materials also provide an "Interactive Triangles" web link, supporting technology-based construction practice.
Final Project
Geometry Stations
Students are asked to complete a "Draw a Triangle" station using a ruler, protractor, and pencil and to specify a type and measure of angle, which has them draw triangles from given angle measures. Students create triangles by specific properties in the "Triangle Matching" activity (e.g., right triangle, isosceles) and produce matching cards, which requires constructing triangles to meet given conditions. The Parent Plan explicitly states that students should "Draw geometric shapes with given conditions using a ruler and protractor," and the Ideas to Think About prompt asks, "What tools can we use to draw triangles?" indicating practice with tools for construction.
