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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
Target Mindy scored exactly 100 on this dart board.
  • How many darts did she throw, and where did they land?
target answer
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

Triangles

Lesson 10-4

triangle
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
Find the missing angle measure
  • <1 = 50° <2= 75° <3 = ?
find the missing angle measure6
Find the missing angle measure
  • <1 = 50° <2= 75° <3 = ?
  • 50 + 75 = 125
  • 180 – 125 = 55°
classify triangles using angles
Classify Triangles Using Angles
  • Acute Triangle
  • Properties: All acute angles.
classify triangles using angles8
Classify Triangles Using Angles
  • Right Triangle
  • Properties: 1 right angle.
classify triangles using angles9
Classify Triangles Using Angles
  • Obtuse Triangle
  • Properties: 1 obtuse angle.
classify triangles using sides
Classify Triangles Using Sides
  • Scalene Triangle
  • Properties: No congruent sides.
classify triangles using sides11
Classify Triangles Using Sides
  • Isosceles Triangle
  • Properties: At least 2 congruent sides.

This symbol represents that the sides are congruent.

classify triangles using sides12
Classify Triangles Using Sides
  • Equilateral Triangle
  • Properties: 3 congruent sides.
naming triangles
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
Name the Triangle
  • Acute Scalene
name the triangle15
Name the Triangle
  • Right Scalene
name the triangle16
Name the Triangle
  • Acute Equilateral
find the missing angle then classify the triangle as acute right or obtuse
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 obtuse18
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 obtuse19
Find the missing angle. Then classify the triangle as acute, right, or obtuse.
  • 20 °, obtuse

30°

x

130°

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