# Target Mindy scored exactly 100 on this dart board. - PowerPoint PPT Presentation

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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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Target Mindy scored exactly 100 on this dart board.

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### 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

• 50 °, right

x

40°

### Find the missing angle. Then classify the triangle as acute, right, or obtuse.

• 135 °, obtuse

20°

25°

x

• 20 °, obtuse

30°

x

130°

### Don’t Forget

• Homework: Lesson 10-4 # 1-18 all