Lesson 7

Symmetry

Est. Class Sessions: 1

Daily Practice and Problems

Teacher Notes
X

TIMS Task

Sketches will vary. One possible sketch is shown for each.

  1. Obtuse
  2. Acute
  3. Obtuse

Ongoing Assessment

Use DPP item T to assess students' abilities to classify acute, obtuse, and right angles [E2] and to estimate the size of an angle using 90° and 180° as benchmarks [E11].

The Angle Circle Activity in Lesson 3 and the Lesson 6 Workshop provide targeted practice.

T. Angles

Use 90° and 180° as benchmarks to draw the following angles.

  1. Sketch an angle that is about 95°.
    Tell if your angle is acute, right,
    or obtuse.
  2. Sketch an angle that is about 45°.
    Tell if your angle is acute, right,
    or obtuse.
  3. Sketch an angle that is about 120°.
    Tell if your angle is acute, right,
    or obtuse.