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A quadrilateral with exactly one pair of parallel sides
trapezoid

Two rays that share an endpoint
angle

A part of a line that has one endpoint and extends indefinitely in one direction.
ray

An infinite set of points forming a straight path extending in two directions.
line

The point at which two line segments, lines or rays meet to form an angle.
vertex

A triangle that has no congruent sides.
scalene

A triangle that has at least two congruent sides
isosceles

A triangle whose sides are all the same length
equilateral

A parallelogram with all four sides equal in length
rhombus

An angle that measures exactly 90 degrees.
right angle

A quadrilateral with two pairs of parallel and congruent sides.
parallelogram

An angle with a measure greater than 90 degrees.
obtuse

An angle with a measure of less than 90 degrees
acute

An instrument for measuring atmospheric pressure, usually to determine altitude or weather changes.
barometer

Any instrument for measuring the watervapor content (humidity) of the atmosphere.
hygrometer

A wind gauge, an instrument for recording the speed and often the direction of winds
anemometer

A measure of the amount of moisture in the air
humidity

Rain, snow, sleet, dew, etc, formed by condensation of water vapour in the atmosphere.
precipitation

the lowest layer of the atmosphere, 6 miles (10 km) high in some areas and as much as 12 miles (20 km) high in others, within which there is a steady drop in temperature with increasing altitude and within which nearly all cloud formations occur and weather conditions manifest themselves.
troposphere

