Measurement and Geometry
Virginia SOL 5.MG.3
Classify and measure angles and triangles, and solve problems involving angles.
What students need to be able to do
- Classify angles as right, acute, obtuse, or straight and justify reasoning.
- Classify triangles as right, acute, or obtuse and equilateral, scalene, or isosceles and justify reasoning.
- Identify congruent sides and right angles using geometric markings to denote properties of triangles.
- Compare and contrast the properties of triangles.
- Identify appropriate tools (protractor, straightedge, angle ruler, technology) to measure and draw angles.
- Measure right, acute, obtuse, and straight angles using appropriate tools and identify measures in degrees.
- Use models to prove that the sum of the interior angles of a triangle is 180 degrees and determine an unknown angle measure in a triangle.
- Solve addition and subtraction contextual problems to determine unknown angle measures on a diagram.