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Angle

Two rays with the same end point.

Acute

Classifying by ANGLES

Right

a positive exponent means the original decimal needs to move to the _______________________

Obtuse

One angle is GREATER than 90

Straight

180 degrees

Reflex

means halfway, or more than 180 degrees but less than 360 degrees.

Supplementary

Angles that add to 180 degrees.

Complementary

Two angles whose sum is 90 degrees.

Interior

an angle inside a shape

Exterior

an angle beside any side of a shape with an extended line

Congruent

A plane figure with the same size and shape.

Acute Angle

An angle that measures LESS than 90 degrees.

right angle

An angle that is 90 degrees (It makes a square in the corner).

Obtuse Angle

An angle that measures MORE than 90 degrees

straight angle

An angle that measures 180 degrees

Congruent Angles

Angles with equal measures are..

Vertical Angles

Angles opposite one another when two lines intersect.

Adjacent Angles

Angles that are next to each other. They share a vertex and a common side.

Complementary Angles

The sum of the measure of two angles is 90 degrees.

Supplementary Angles

The sum of the measure of two angles is 180 degrees.

Angle Ruler

A tool with two transparent, adjustable arms linked by a rivet used to measure angles from 0 to 360 degrees.

Protractor

A tool used to measure angles

polygon

a closed figure made by joining line segments where each line segment intersects exactly 2 others

regular polygon

a convex polygon in which all sides and angles are congruent

Irregular Polygon

A polygon in which not all of the sides are the same length and not all of the angles have the same measure.

Convex Polygon

A polygon with all interior angles measuring less than 180 degrees.

Concave Polygon

A polygon with at least one interior angle whose measure is greater than 180 degrees.

Interior angle

angle on the inside of intersected parallel lines

Exterior angle

angle on the outside of intersected parallel lines

degrees

a unit for measuring angles

vertex

The point where two sides meet. (Shared end points of the line segments of a polygon.)

isosceles triangle

Triangle with 2 equal sides and 2 equal angles.

Parallelogram

p=s+s+b+b

Right Triangle

A triangle with one right angle.

sum

the answer to an addition problem

product

the answer to a multiplication problem

Trapezoid

P=s1+s2+b1+b2

Rhombus

a parallelogram with four equal sides and equal opposite angles.

diameter

A straight line passing through the centre of a circle to touch both sides of the circumference.

radius

From center to a point on the circle.

area

the surface; Length x Width