Geometry: Parallelograms and Triangles
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Questions and Answers

Match the following terms with their definitions.

POYB = PQYD and BQXC are parallelograms AXYB = is a rectangle PBQC = is a trapezium XQYD = is a parallelogram

Flashcards

Parallelogram

A quadrilateral with opposite sides parallel.

Trapezoid

A quadrilateral with one pair of parallel sides.

Triangle

A figure formed by three line segments.

Diagonal

A line segment that connects two non-adjacent vertices of a quadrilateral.

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Altitude

A line segment drawn from a vertex of a triangle perpendicular to the opposite side.

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Area

The area enclosed within the boundaries of a shape.

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Area Ratio

The ratio of the area of a triangle to the area of the parallelogram.

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Proof

A statement that is proven to be true based on given information.

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Area of a Parallelogram

The product of the base and height of a parallelogram.

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Area of a Triangle

Half the product of the base and height of a triangle.

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Midsegment

The line segment connecting midpoints of two sides of a triangle.

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Axiom

A statement that is accepted as true without proof.

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Theorem

A statement that can be proven using other known theorems.

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Deductive Reasoning

The process of using given facts and logical reasoning to draw conclusions.

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Inductive Reasoning

The process of using specific examples to form a general conclusion.

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Equal Base and Height Theorem

A principle that states the areas of two triangles with equal heights and bases are equal.

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Parallelogram Area Theorem

A principle stating that the area of a parallelogram is equal to the area of the rectangle with same base and altitude.

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Triangle Area Theorem

A principle stating the area of a triangle is half the area of the rectangle with same base and altitude.

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Composite Figure

A figure formed by joining two triangles along a common side.

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Decomposition

The process of breaking down complex shapes into simpler ones.

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Study Notes

Parallelogram Properties

  • Parallelograms have opposite sides parallel and equal in length
  • Opposite angles are equal
  • Adjacent angles add up to 180 degrees
  • Diagonals bisect each other

Triangles and Parallelograms

  • The area of a triangle is half the area of a parallelogram with the same base and height
  • The area of a parallelogram is base times height

Area of Triangles

  • Area of a triangle is 1/2 * base * height
  • If two triangles have the same height, the ratio of their areas is equal to the ratio of their bases
  • The area of triangles with equal bases is in ratio to their altitude

Similar Triangles

  • If two triangles are similar, the ratio of their corresponding sides is equal to the ratio of their corresponding altitudes
  • If two triangles are similar, the ratio of their areas is equal to the square of the ratio of their corresponding sides

Special Cases of Parallelograms:

  • Squares have all sides equal and all angles are right angles
  • Rectangles have opposite sides equal and all angles are right angles
  • Rhombuses have all sides equal and diagonals bisect the angles
  • Kites have two pairs of adjacent sides equal and diagonals are perpendicular

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Description

Test your knowledge on the properties of parallelograms and triangles in this quiz. Discover how areas are calculated and the relationships between similar triangles. Brush up on key concepts such as angle measures, bisectors, and area ratios.

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