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Consider: Which figures are congruent? Why?

Geometry Section 4-2A Correspondence and Congruence Pg. 256 – Please get your book. Wednesday, you will need a ruler (cm) and protractor. Consider: Which figures are congruent? Why?. Pg. 256.

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Consider: Which figures are congruent? Why?

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  1. Geometry Section 4-2ACorrespondence and CongruencePg. 256 – Please get your book.Wednesday, you will need a ruler (cm) and protractor.

  2. Consider:Which figures are congruent? Why? Pg. 256 For the pairs of congruent figures, what transformations are necessary to move one figure so that it coincides with the other?

  3. The 2 triangles on page 256 are congruent. Measure the segments and angles to find the corresponding parts. AB YX BC ZY CA XZ ÐA ÐX ÐB ÐY ÐC ÐZ Pg. 256 rABC @rZYX

  4. Suppose rJKL @rPQR. List all pairs of sides and angles that must be congruent. JK @ KL @ JL @ ÐJ @ ÐK @ ÐL @ PQ Letters MUST be in the correct order! QR PR ÐP ÐQ ÐR

  5. Write a congruence statement for these triangles. Try It: Pg. 257 rMNO @rTUS

  6. A correspondence between two geometric figures is any way of pairing up their vertices. A congruence correspondence matches the vertices so that all pairs of corresponding parts are congruent. Pg. 257

  7. The symbol for “corresponds to” is «. For example rABC«rZYX. The order of the letters in the statement specifies the corresponding sides and angles. Pg. 257

  8. Definition: Two triangles are congruenttrianglesif and only if all of their corresponding parts are congruent. Pg. 258 Congruent triangles Non-Congruent triangles

  9. Give a congruence correspondence for each figure. Use the figure @ to write the congruence. #1 Pg. 258 rDEF @rXZY

  10. Give a congruence correspondence for each figure. Use the figure @ to write the congruence. #2 Pg. 258 rGHI @rNPM

  11. Draw rXYZ and rUVW so that rXYZ @rUVW. Mark the congruent parts. List the pairs of corresponding congruent parts. #3 Pg. 258

  12. Draw and mark triangles for the congruence rJKL @rMNP. Rewrite the congruence in 5 other ways. #4 Pg. 258

  13. Write congruence statements for the triangles in the figure that appear to be congruent. #8 Pg. 258 rTXW @rVYU rTYU @rVXW rTWV @rVUT

  14. In the figure, rABC @rEDC. Find each measure. #9 -12 Pg. 259 • mÐD = 10. CE = • 11. MÐDCE = 12. BC = 80o 12 65o 8

  15. In the figure, rTUV @rWZY. Find each measure. #13 -16 Pg. 259 6 3 • 13. YZ = 14. WY = • 15. VT = 16. TU = 4 3

  16. Homework: Practice 4-2A

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