Target Mindy scored exactly 100 on this dart board.

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# Target - PowerPoint PPT Presentation

Target Mindy scored exactly 100 on this dart board. How many darts did she throw, and where did they land?. Target Answer. Mindy shot 6 darts. She hit the 16, 2 times and hit the 17, 4 times. 16 x 2 = 32 17 x 4 = 68 32 + 68 = 100. Triangles. Lesson 10-4. Triangle.

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Presentation Transcript
Target Mindy scored exactly 100 on this dart board.
• How many darts did she throw, and where did they land?
• Mindy shot 6 darts.
• She hit the 16, 2 times and hit the 17, 4 times.
• 16 x 2 = 32
• 17 x 4 = 68
• 32 + 68 = 100

### Triangles

Lesson 10-4

Triangle
• A triangle is a figure that has 3 sides and 3 angles. The sum of the measure of the angles is 180°
• m<1 + m<2 + m<3 = 180°

1

2

3

Find the missing angle measure
• <1 = 50° <2= 75° <3 = ?
Find the missing angle measure
• <1 = 50° <2= 75° <3 = ?
• 50 + 75 = 125
• 180 – 125 = 55°
Classify Triangles Using Angles
• Acute Triangle
• Properties: All acute angles.
Classify Triangles Using Angles
• Right Triangle
• Properties: 1 right angle.
Classify Triangles Using Angles
• Obtuse Triangle
• Properties: 1 obtuse angle.
Classify Triangles Using Sides
• Scalene Triangle
• Properties: No congruent sides.
Classify Triangles Using Sides
• Isosceles Triangle
• Properties: At least 2 congruent sides.

This symbol represents that the sides are congruent.

Classify Triangles Using Sides
• Equilateral Triangle
• Properties: 3 congruent sides.
Naming Triangles
• Triangles have a 2 part name.
• The first part of the name, names the angles (acute, obtuse, or right)
• The second part of the name, names the sides (scalene, isosceles, or equilateral)
• Example: Obtuse Scalene
Name the Triangle
• Acute Scalene
Name the Triangle
• Right Scalene
Name the Triangle
• Acute Equilateral
Find the missing angle. Then classify the triangle as acute, right, or obtuse.
• 50 °, right

x

40°

Find the missing angle. Then classify the triangle as acute, right, or obtuse.
• 135 °, obtuse

20°

25°

x

Find the missing angle. Then classify the triangle as acute, right, or obtuse.
• 20 °, obtuse

30°

x

130°

Don’t Forget
• Homework: Lesson 10-4 # 1-18 all