MICRO LESSON 1
What Is a Quadrilateral?
Picture it:
Join four points to make a closed shape.
Simple:
A quadrilateral has four sides, four vertices and four angles.
Example:
Rectangle, square, kite.
Quick Check:
How many diagonals?
MICRO LESSON 2
Angle Sum
Picture it:
A quadrilateral can be split into two triangles.
Simple:
Its interior angles sum to 360°.
Example:
90°+90°+90°+90°=360°.
Quick Check:
Find fourth angle if others total 250°.
MICRO LESSON 3
Parallelogram
Picture it:
Opposite sides run parallel.
Simple:
A parallelogram has both pairs of opposite sides parallel.
Example:
A slanted rectangle shape.
Quick Check:
Are adjacent sides always equal?
MICRO LESSON 4
Parallelogram Properties
Picture it:
Opposite sides and angles are equal.
Simple:
Diagonals bisect each other.
Example:
Each diagonal forms congruent triangles.
Quick Check:
What do diagonals do?
MICRO LESSON 5
Rectangle
Picture it:
A rectangle is a parallelogram with four right angles.
Simple:
Its diagonals are equal and bisect each other.
Example:
A book cover.
Quick Check:
Are diagonals perpendicular always?
MICRO LESSON 6
Rhombus
Picture it:
A rhombus has all sides equal.
Simple:
Its diagonals bisect at right angles.
Example:
Diamond shape.
Quick Check:
Are all angles 90°?
MICRO LESSON 7
Square
Picture it:
A square combines rectangle and rhombus properties.
Simple:
All sides equal and all angles 90°.
Example:
Floor tile.
Quick Check:
What happens to diagonals?
MICRO LESSON 8
Midpoint Theorem
Picture it:
A line joining midpoints of two sides of a triangle is parallel to third side and half its length.
Simple:
This theorem links triangles and quadrilaterals.
Example:
Midpoint segment mirrors the base.
Quick Check:
If base is 10 cm, midpoint line?