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MA.912.G.8.4 Conjectures

 

texas instruments ti 30xs

Two-Dimensional

Three-Dimensional

Trig & Discrete Math

In Your Text

Throughout the Text
Section 1-4; 36-44
Section 2-6; 134-141
Explore 3-3; 185
Section 5-4; 351-358
Section 7-7; 512-517
Extend 12-4; 830-837

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What You Need To Know...

How to make conjectures with justifications about geometric ideas.

  1. The benchmark will be assessed using MC (Multiple Choice) items.
  2. Items may include proofs about congruent/similar triangles and parallel lines.

Example One

For his mathematics assignment, Armando must determine the conditions that will make quadrilateral ABCD, shown below, a parallelogram.

 8-4

Given that the m∠ DAB = 40°, which of the following statements will guarantee that ABCD is a parallelogram?

  1. m∠ ADC + m∠ DCB + m∠ ABC + 40°  = 360°.  
  2. m∠ DCB  = 40°; m∠ ABC  = 140° 
  3. m∠ ABC + 40° = 180° 
  4. m∠ DCB  = 40° 

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Additional Examples

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VideoTutorial
Inductive Reasoning
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Deductive Reasoning
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Exploring Proofs
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Reference Sheet

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