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Level 431

Measurement: Angles


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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