SHAPES. GEOMETRY . TRIANGLE – 3 SIDED SHAPE TRI MEANS 3. TRIANGLE. TRIcycle (3 wheels). TRIlogy (3 books in the series ). (3 Horns). A quadrilateral is a polygon with 4 sides. These are all quadrilaterals: . QUADRILATERAL. “Quad” means 4. Quadrant – 4 sections.
TRIlogy (3 books in the series)
Quadrant – 4 sections
Quadriceps – 4 muscles
Quadruplets (4 babies)
Pentagram – 5 pointed star
U.S. Pentagon in Washington D.C.
Hexagram – 6-pointed star
HEX nut – six sided nut
Hexapod – 6 feet
Heptadactyly– 7 fingers on 1 hand
Heptathlon – 7 event competition
Octogenarian – a person who is in there 80’s
Octopus – 8 legs
Enneagram – 9 personality types
Decimal – base 10 number system
Decade – 10 years
Decathalon – 10 track and field events
A triangle has 3 sides and 3 angles
An EQUILATERAL triangle has 3 equal sides and 3 equal angles (always 60 degrees)
An ISOSCELES triangle has 2 equal sides and 2 equal angles
An SCALENE triangle has NO equal sides and NO equal angles
An ACUTE triangle is a triangle with ALL angles less than 90 degrees.
A RIGHT triangle is a triangle with a 90 degree angle.
An OBTUSE triangle is a triangle with an angle of more than 90 degrees.
isosceles right triangle
An equilateral triangle is always….
In a right triangle, one of the angles is a right angle—an angle of 90 degrees. A right triangle may be isosceles or scalene.
In an obtuse triangle, one angle is greater than a right angle—it is more than 90 degrees. An obtuse triangle may be isosceles or scalene.
In an acute triangle, all angles are less than right angles—each one is less than 90 degrees. An acute triangle may be equilateral, isosceles, or scalene.
2. Obtuse scalene triangle
3. Acute equilateral triangles