AA~ is/is not sufficient to guarantee that two triangles are similar.
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1 DO NOW Geometry Regents Lomac Date. due. Similar Triangles Shortcuts AA, SSS, SAS 6.3 (DN) ON THE BACK OF THIS PACKET What defines a similarity transformation? Name Per LO: I can show that triangles are similar using the AA, SSS, and SAS similarity shortcuts. (1) tracing paper or transparen cy and dry erase markers Similarity: Shortcuts for showing triangles are similar (a) How much evidence is sufficient (enough) to show that two triangles are similar. Triangles are similar if there is a similarity transformation (any combination of translations, rotations, reflections, and dilations) that maps one triangle to the other. Below is the information from the dilation & side splitter theorems. Describe in words what the theorems tells us, then use it to answer the questions that follow. AA~ X X Y L Y XE XY = XM XL = EM YL L E M E M (b) Is AA (2 pairs of congruent corresponding angles) enough to know you can map one triangle to another? Use the diagram to show that triangle PRI is similar to triangle TSN. (Hint: Can we transform one triangle and be sure that we have one of the two diagrams above?) N P R T S I AA~ is/is not sufficient to guarantee that two triangles are similar.
2 (2) tracing paper or transparen cy and dry erase markers Similarity: Shortcuts for showing triangles are similar 6.3 SSS~ We have shown that SSS is enough to show that a pair of triangles is congruent. Since congruence is a special case of similarity (when r = 1) we can show that two triangles are similar by SSS~. Instead of showing 3 pairs of congruent sides, we can show that all 3 ratios of corresponding side lengths are equal. Show that triangle PRI is similar to triangle TSN. 4 N 3 P 15 R T 5 S 12 9 I SSS~ is/is not sufficient to guarantee that two triangles are similar. (3) tracing paper or transparen cy and dry erase markers Similarity: Shortcuts for showing triangles are similar SAS~ We have shown that SAS is enough to show that a pair of triangles is congruent. Since congruence is a special case of similarity (when r = 1) we can show that two triangles are similar by SAS~. Instead of showing 2 pairs of congruent sides, we can show that 2 ratios of corresponding side lengths are equal and the pair of angles between are congruent. Show that triangle PRI is similar to triangle TSN. 7 N 4 P R T S I SAS~ is/is not sufficient to guarantee that two triangles are similar.
3 6.3 (4) highlighters & calculators Similarity: Determining similar triangles. Are the triangles shown below similar? Use highlighter to mark the parts you are using to show the triangles are similar. Circle the letter of your choice.
4 6.3 (4) highlighters & calculators Similarity: Determining similar triangles. Are the triangles shown below similar? Use highlighter to mark the parts you are using to show the triangles are similar. Circle the letter of your choice.
5 6.3 (5) highlighters Similarity: Determining similar triangles. Are the triangles shown below similar? Use highlighter to mark the parts you are using to show the triangles are similar. Write a proof (I know that... because... ). (a) (b)
6 6.3 (5) highlighters & calculators Similarity: Determining similar triangles. Are the triangles shown below similar? Use highlighter to mark the parts you are using to show the triangles are similar. Write a proof (I know that... because... ). (c) (d)
7 6.3 (6) Similar Triangles Shortcuts: Lesson Summary Describe the information needed to use each shortcut and make a sketch. (1) AA~ (2) SSS~ (3) SAS~ (7) compass, straightedg e Exit Ticket The Exit Ticket is on the last page of this packet. Do it, tear it off and turn it in. (8) compass, straightedg e Homework: (1) Draw segment EX. Construct the perpendicular bisector of EX and label it IT. Dilate segment EX from center T with a scale factor of ½. What type of triangles are TEX and TE'X'?
8 (8) compass, straightedg e Homework: Are the triangles shown below similar? Use highlighter to mark the parts you are using to show the triangles are similar. Write a proof (I know that... because... ). 6.3 (2) (3)
9 (8) cont. Homework (4) 6.3 (5)
10
11 Exit Ticket Name Date Per 6.3 Provide sufficient information to prove that each pair of triangles is similar OR to state that the triangles cannot be proven similar. (1) (2) (3)
12 DO NOW Name Date Per 6.3 (DN) What defines a similarity transformation?
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