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Chapter 8
Right Triangles
8-1 Similarity in Right Triangles
Geometric Mean
If a, b, and x are positive numbers and
𝑎
𝑥
=
𝑥
𝑏
then x is called the geometric mean between
a and b.
Find the geometric mean between 22 and 55.
11 10
Simplifying Radicals
• We will be leaving radicals in simplified
radical form.
• We will not be changing radicals to
decimals.
• Practice simplifying radicals and finding
the geometric mean on the next slide and
bring the answers to class tomorrow. (HW)
HW Part 1
Theorem 8-1
If the altitude is drawn to the hypotenuse of a right
triangle, then the two triangles formed are similar to
the original triangle and to each other.
A
BC
N
∆𝐴𝐵𝐶~∆𝐴𝐶𝑁~∆𝐶𝐵𝑁
Corollary 1
When the altitude is drawn to the hypotenuse of a
right triangle, the length of the altitude is the
geometric mean between the segments of the
hypotenuse.
A
BC
N
𝐴𝑁
𝐶𝑁
=
𝐶𝑁
𝐵𝑁
Corollary 2
When the altitude is drawn to the hypotenuse of a
right triangle, each leg is the geometric mean
between the hypotenuse and the segment of the
hypotenuse that is adjacent to that leg.
A
BC
N
𝐴𝐵
𝐴𝐶
=
𝐴𝐶
𝐴𝑁
and
𝐴𝐵
𝐵𝐶
=
𝐵𝐶
𝐵𝑁
HW Part 2
• Find the values of the unknowns.
y
w
x
z
6
18

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8 1 Similarity in Right Triangles

  • 1. Chapter 8 Right Triangles 8-1 Similarity in Right Triangles
  • 2. Geometric Mean If a, b, and x are positive numbers and 𝑎 𝑥 = 𝑥 𝑏 then x is called the geometric mean between a and b. Find the geometric mean between 22 and 55. 11 10
  • 3. Simplifying Radicals • We will be leaving radicals in simplified radical form. • We will not be changing radicals to decimals. • Practice simplifying radicals and finding the geometric mean on the next slide and bring the answers to class tomorrow. (HW)
  • 5. Theorem 8-1 If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. A BC N ∆𝐴𝐵𝐶~∆𝐴𝐶𝑁~∆𝐶𝐵𝑁
  • 6. Corollary 1 When the altitude is drawn to the hypotenuse of a right triangle, the length of the altitude is the geometric mean between the segments of the hypotenuse. A BC N 𝐴𝑁 𝐶𝑁 = 𝐶𝑁 𝐵𝑁
  • 7. Corollary 2 When the altitude is drawn to the hypotenuse of a right triangle, each leg is the geometric mean between the hypotenuse and the segment of the hypotenuse that is adjacent to that leg. A BC N 𝐴𝐵 𝐴𝐶 = 𝐴𝐶 𝐴𝑁 and 𝐴𝐵 𝐵𝐶 = 𝐵𝐶 𝐵𝑁
  • 8. HW Part 2 • Find the values of the unknowns. y w x z 6 18