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## GBK Geometry

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**GBK Geometry**Jordan Johnson**Today’s plan**• Greeting • Homework Questions? • (pp. 392-394, review proof, Asgs #67-70) • Practice Quiz • Return work • Lesson & Proof: • Applying the Side-Splitter Theorem • Proving the AA Theorem • Homework / Questions • Clean-up**Practice Quiz**• Iff a⁄b = b⁄c, then b is the _____________ of a and c. • Find the exact means of... Arithmetic Geometric • 5 and 45 • 14 and 2 • 81 and 9 • Find two pairs of numbers whose geometric mean is 10.**AA Similarity**• Theorem 45 (The AA Similarity Theorem): • If two angles of one triangle are equal to two angles of another triangle, then the two triangles are similar. • Given: • Triangles ABC and DEF. • A = D and B = E. • Prove:ABC ~ DEF. • Strategy: Prove C = F, then prove all pairs of sides are proportional.**Homework**• Log 25+ minutes: • Asgs #67-70 • Proof: • Prove: If ΔABC ΔDEF, then ΔABC ~ΔDEF. • Prove that similarity is transitive. • Prove the AA Similarity Theorem. • Unit 9 Test Analysis (due Wed.)**Clean-up / Reminders**• Pick up all trash / items. • Push in chairs (at front and back tables). • See you tomorrow!