ACOS Objective 12


Determine the lengths of missing sides and measures of angles in similar and congruent figures.
  • Applying proportional reasoning
  • Using dilations on the coordinate plane to determine measures of similar figures
  • Finding the ratios of the perimeters and areas of similar triangles, trapezoids, and parallelograms

ARMT Possible Points = 4 (MC, GR)
  • Diagrams may be included.
  • Use of the scale factor will be required.
  • Fraction or decimal representation of a real number may be used.
  • Determining the measurements of sides when the measurements of the sides are expressed as algebraic expression may be required.
  • Inscribed figures may be used.
  • Reflected (translated) figures may be used.