Derek Owens Geometry Chapter 11 Flashcards

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Questions and Answers

The __________ to the hypotenuse of a right triangle forms two triangles similar to it and to each other.

altitude

The altitude to the hypotenuse of a right triangle is the _____________ _________ between the segments into which it divides the hypotenuse.

geometric mean

Each leg of a right triangle is the geometric mean between the hypotenuse and its _____________ onto the hypotenuse.

projection

What is the Pythagorean Theorem?

<p>In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the legs.</p> Signup and view all the answers

What does the Isosceles Right Triangle Theorem state?

<p>In an isosceles right triangle, the hypotenuse is √2 times the length of a leg.</p> Signup and view all the answers

Each diagonal of a square is ______ times the length of one side.

<p>√2</p> Signup and view all the answers

What does the 30-60-90 Right Triangle Theorem state?

<p>In a 30-60 right triangle, the hypotenuse is twice the shorter leg and the longer leg is √3 times the shorter leg.</p> Signup and view all the answers

Two non vertical lines are parallel iff___________________

<p>Their slopes are equal</p> Signup and view all the answers

Two non vertical lines are perpendicular iff ____________.

<p>The product of their slopes is -1</p> Signup and view all the answers

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Study Notes

Right Triangle Properties

  • The altitude to the hypotenuse of a right triangle creates two triangles that are similar to the original triangle and to each other.
  • The altitude divides the hypotenuse into segments where each segment's length represents the geometric mean of the two segments.

Leg and Hypotenuse Relationships

  • Each leg of a right triangle acts as the geometric mean between the hypotenuse and the projection of that leg onto the hypotenuse.

Pythagorean Theorem

  • The relationship expressed by the Pythagorean Theorem states that in a right triangle, the square of the hypotenuse equals the sum of the squares of the two legs (a² + b² = c²).

Isosceles Right Triangle Theorem

  • In an isosceles right triangle, the hypotenuse's length is √2 times the length of each leg.

Square Diagonal Relationship

  • Each diagonal of a square is √2 times the length of one of its sides.

30-60-90 Right Triangle Theorem

  • In a 30-60 right triangle, the hypotenuse is double the length of the shorter leg, while the longer leg measures √3 times the length of the shorter leg.

Parallel Lines

  • Two non-vertical lines are parallel if their slopes are equal, indicating that they run in the same direction without intersecting.

Perpendicular Lines

  • Two non-vertical lines are considered perpendicular if the product of their slopes equals -1, indicating they intersect at a right angle.

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