Math Vocab 5: Geometry Part 2

Angles in Geometry

• Acute Angle: Measures less than 90 degrees.
• Obtuse Angle: Measures greater than 90 degrees but less than 180 degrees.
• Straight Angle: Measures exactly 180 degrees.

Tools for Measuring Angles

• Protractor: Essential tool for measuring or creating angles with precision.

Transformations in Geometry

• Slide (Translation): Moving a shape smoothly across a surface without rotation or flipping.
• Flip (Reflection): Turning a shape over to face the opposite direction.
• Turn (Rotation): Rotating a shape around a fixed point on a plane.

Classification of Shapes

• Similar Shapes: Identical shape with proportional size differences.
• Congruent Shapes: Exact same shape and size without any alteration.

Types of Triangles by Side Length

• Equilateral Triangle: All three sides are of equal length.
• Scalene Triangle: All three sides have different lengths.
• Isosceles Triangle: Two sides are equal in length; may also be equilateral if all sides are equal.

Types of Triangles by Angle

• Right Triangle: Contains one right angle (90 degrees).
• Obtuse Triangle: Contains one obtuse angle (greater than 90 degrees).
• Acute Triangle: All three angles are acute (less than 90 degrees).

Circle Measurements

• Circumference: Total distance around the circle's boundary.
• Chord: Line segment connecting two points on a circle's circumference.
• Diameter: Line segment passing through the center from one edge of the circle to the other.
• Radius: Distance from the center of the circle to any point on the circumference.

Coordinate Geometry

• Origin: The intersection point of the x and y axes on the coordinate plane, represented as (0,0).