The World of Geometry
Getting to learn more about Geometry!
Introducing Angles!
Right Angle
90 degrees
Acute Angle
LESS than 90 degrees
Obtuse Angle
MORE than 90 degrees, but LESS than 180 degrees
Classifying Quadrilaterals
Parallelogram
- Quadrilateral (4 sides)
- Opposite SIDES = congruent
- Opposite ANGLES = congruent
- Opposite sides = parallel
Rectangle
- Quadrilateral
- Opposite sides = PARALLEL
- ALL 4 angles = right (90 degrees)
- Opposite sides = CONGRUENT!
Rhombus
- Quadrilateral
- Opposite sides = parallel
- ALL sides are CONGRUENT!
- Opposite angles = congruent
Square
- Quadrilateral
- ALL angles = right (90 degrees)
- Opposite sides = PARALLEL!
- ALL SIDES are CONGRUENT!!
Types of Triangles
There are 6 types of TRIANGLES! Let me show you.
I'm an ACUTE triangle
I have 3 ACUTE angles.
I'm a RIGHT triangle
I have 1 RIGHT angle and 2 ACUTE angles.
I'm an OBTUSE triangle
I have 1 OBTUSE angle and 2 ACUTE angles.
I'm a SCALENE triangle
I have 0 CONGRUENT sides and 0 CONGRUENT angles.
I'm an ISOSCELES triangle
I have 2 CONGRUENT sides and 2 CONGRUENT angles.
I'm an EQUILATERAL triangle
I have 3 CONGRUENT sides and angles.
The Case of the MISSING angles
Case Details
- ALL the angles of a quadrilateral = 360 degrees
- ALL the angles of a triangle = 180 degrees
Want to find the MISSING angles?
You're the detective. Watch this video and it'll lead you to the Missing Angles.
Welcome to Vocabulary Mania!
Ready to learn more?
- Congruent- SAME shape, SAME size, SAME EVERYTHING!
- Quadrilateral- A 4-sided polygon
- Polygon- closed shape
- Angle- a formation of two rays combined with a vertex
- Vertex- An endpoint