Download presentation

Presentation is loading. Please wait.

1
Splash Screen

2
**Five-Minute Check (over Lesson 10–2) Then/Now New Vocabulary **

Key Concept: Angles of a Triangle Example 1: Find Angle Measures Example 2: Use Ratios to Find Angle Measures Key Concept: Types of Angles Example 3: Real-World Example: Classify Angles Key Concept: Classify Triangles by Angles Key Concept: Classify Triangles by Sides Example 4: Classify Triangles Lesson Menu

3
**Name all the sets of numbers to which 0.54 belongs?**

__ A. rational B. whole C. irrational D. rational, integer 5-Minute Check 1

4
A. > B. < C. ≥ D. = 5-Minute Check 2

5
**Which list of numbers is correctly ordered from least to greatest?**

5-Minute Check 3

6
**Solve y2 = 12. Round to the nearest tenth if necessary.**

B. 6 C. –3.5, 3.5 D. 3.5 5-Minute Check 4

7
A. 6.5 ft B. 6.6 ft C. 6.7 ft D. 6.8 ft 5-Minute Check 5

8
**Which of the following is an example of an irrational number?**

D. 5-Minute Check 6

9
**You solved equations by adding or subtracting. (Lesson 4–3)**

Find the missing angle measure of a triangle. Classify triangles by properties and attributes. Then/Now

10
line segment triangle vertex congruent Vocabulary

11
Concept A

12
**Find the value of x in ΔDEF.**

Find Angle Measures Find the value of x in ΔDEF. Write an equation. x = 180 Substitution 133 + x = 180 Simplify. 133 – x = 180 – Subtract 133 from each side. x = 47 Simplify. Answer: x is 47, so mF = 47°. Example 1

13
**Find the value of x in ΔMNO.**

B. 123 C. 139 D. 303 Example 1

14
**Use Ratios to Find Angle Measures**

ALGEBRA The measures of the angles of a triangle are in the ratio 2:3:5. What are the measures of the angles? Example 2

15
**2x + 3x + 5x = 180 Write the equation.**

Use Ratios to Find Angle Measures 2x + 3x + 5x = 180 Write the equation. 10x = 180 Combine like terms. Divide each side by 10. x = 18 Simplify. Since x = 18, 2x = 2(18) or 36, 3x = 3(18) or 54, and 5x = 5(18) or 90. Answer: The measures of the angles are 36°, 54°, and 90°. Example 2

16
ALGEBRA The measures of the angles of a certain triangle are in the ratio 3:5:7. What are the measures of the angles? A. 12°, 60°, 84° B. 30°, 50°, 70° C. 36°, 60°, 84° D. 40°, 60°, 80° Example 2

17
Concept B

18
**Answer: 45° is less than 90°, so it is an acute angle.**

Classify Angles HUMAN JAWS Humans have jaws that can open to about 45°. What type of angle is formed by the jaws of a human? Answer: 45° is less than 90°, so it is an acute angle. Example 3

19
**A bird’s beak can open to about 80°. What kind of angle is this?**

A. acute B. right C. obtuse D. straight Example 3

20
Concept C

21
Concept D

22
**A. Classify the triangle below by its angles and by its sides.**

Classify Triangles A. Classify the triangle below by its angles and by its sides. Angles: The triangle has an obtuse angle. Sides: The triangle has no congruent sides. Answer: The triangle is an obtuse scalene triangle. Example 4

23
**B. Classify the triangle by its angles and by its sides.**

Classify Triangles B. Classify the triangle by its angles and by its sides. Angles: The triangle has a right angle. Sides: The triangle has two congruent sides. Answer: The triangle is a right isosceles triangle. Example 4

24
**A. Classify the triangle by its angles and by its sides.**

A. right scalene B. obtuse scalene C. obtuse isoceles D. acute equilateral Example 4 CYP A

25
**B. Classify the triangle by its angles and by its sides.**

A. right isoceles B. obtuse isoceles C. obtuse scalene D. acute equilateral Example 4 CYP B

26
End of the Lesson

Similar presentations

OK

Holt CA Course 1 8-4 Triangles Vocabulary Triangle Sum Theoremacute triangle right triangleobtuse triangle equilateral triangle isosceles triangle scalene.

Holt CA Course 1 8-4 Triangles Vocabulary Triangle Sum Theoremacute triangle right triangleobtuse triangle equilateral triangle isosceles triangle scalene.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on asymptotic notation of algorithms examples Ppt on safer construction practices in disaster prone areas A ppt on loch ness monster photos Download ppt on teamviewer 9 Download ppt on civil disobedience movements Ppt on cartesian product model Ppt on molecular biology of head neck cancer Ppt on ufo and aliens facts Download ppt on 2d and 3d shapes Ppt on vertical axis wind turbine