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Splash Screen.

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Presentation on theme: "Splash Screen."— Presentation transcript:

1 Splash Screen

2 Five-Minute Check (over Lesson 4–1) CCSS Then/Now New Vocabulary
Theorem 4.1: Triangle Angle-Sum Theorem Proof: Triangle Angle-Sum Theorem Example 1: Real-World Example: Use the Triangle Angle-Sum Theorem Theorem 4.2: Exterior Angle Theorem Proof: Exterior Angle Theorem Example 2: Real-World Example: Use the Exterior Angle Theorem Corollaries: Triangle Angle-Sum Corollaries Example 3: Find Angle Measures in Right Triangles Lesson Menu

3 Classify ΔRST . A. acute B. equiangular C. obtuse D. right
5-Minute Check 1

4 Find y if ΔRST is an isosceles triangle with RS  RT.
___ A. 8 B. 10 C. 12 D. 14 5-Minute Check 2

5 Find x if ΔABC is an equilateral triangle.
5-Minute Check 3

6 A. ΔABC B. ΔACB C. ΔADC D. ΔCAB 5-Minute Check 4

7 Classify ΔMNO as scalene, isosceles, or equilateral if MN = 12, NO = 9, and MO = 15.
A. scalene B. isosceles C. equilateral 5-Minute Check 5

8 Which is not a classification for ΔFGH?
A. acute B. scalene C. isosceles D. equiangular 5-Minute Check 6

9 G.CO.10 Prove theorems about triangles. Mathematical Practices
Content Standards G.CO.10 Prove theorems about triangles. Mathematical Practices 1 Make sense of problems and persevere in solving them. 3 Construct viable arguments and critique the reasoning of others. CCSS

10 You classified triangles by their side or angle measures.
Apply the Triangle Angle-Sum Theorem. Apply the Exterior Angle Theorem. Then/Now

11 remote interior angles flow proof corollary
auxiliary line exterior angle remote interior angles flow proof corollary Vocabulary

12 Concept 1

13 Concept 2

14 Use the Triangle Angle-Sum Theorem
SOFTBALL The diagram shows the path of the softball in a drill developed by four players. Find the measure of each numbered angle. Example 1

15 Find the measure of 3. A. 95 B. 75 C. 57 D. 85 Example 1

16 Concept 4

17 GARDENING Find the measure of FLW in the fenced flower garden shown.
Use the Exterior Angle Theorem GARDENING Find the measure of FLW in the fenced flower garden shown. Example 2

18 The piece of quilt fabric is in the shape of a right triangle
The piece of quilt fabric is in the shape of a right triangle. Find the measure of ACD. A. 30 B. 40 C. 50 D. 130 Example 2

19 Concept 5

20 Find the measure of each numbered angle.
Find Angle Measures in Right Triangles Find the measure of each numbered angle. Example 3

21 Find m3. A. 50 B. 45 C. 85 D. 130 Example 3


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