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Geometry
2 dimensional figures
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Terms in this set (20)
square
quadrilateral with 4 equal sides, 4 right angles; Exactly 2 pairs of parallel sides. opposite sides and angles are congruent.
regular polygon
(a.k.a. rhombus, rectangle, parallelogram)
rhombus
quadrilateral with 4 equal sides;
Exactly 2 pairs of parallel sides. opposite sides and angles are congruent. regular polygon.
parallelogram
quadrilateral with 2 pairs of parallel sides. Opposite sides and angles are congruent.
trapezoid
quadrilateral with 1 pair of parallel sides
rectangle
quadrilateral with opposite equal sides, 4 right angles. Exactly 2 pairs of parallel sides.
polygon
a closed plane figure formed by three or more line segments that meet at points called vertices. It is named by the number of sides and angles it has.
hexagon
has six sides, six angles and six vertices (points)
regular polygon
all sides are congruent, all angles are congruent
Parallel lines
lines that never intersect
Perpendicular lines
Lines that intersect to form right angles
Intersecting lines
lines that intersect or cross at one point.
right angle
an angle that measures 90 degrees
acute angle
an angle that measures less than 90 degrees
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
Equilateral triangle
A triangle with three congruent sides and 3 congruent angles. all angles are acute.
Isosceles triangle
A triangle with 2 congruent sides and 2 congruent angles. Angles can be acute, obtuse and right.
Scalene Triangle
A triangle with no congruent sides. Angles can be acute, obtuse, and right.
Acute Triangle
A triangle with 3 acute angles.
Right Triangle
A triangle with 1 right angle and 2 acute angles.
obtuse Triangle
A triangle with one obtuse angle and 2 acute angles.
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Verified questions
GEOMETRY
Draw ΔXYZ and find the slope of each side of the triangle. Determine whether the triangle is a right triangle. Explain. X (0, 0), Y (1, h), Z (2h, 0)
GEOMETRY
The surface area of Earth is about 196.9 million square miles. The land area is about 57.5 million square miles, and the rest is water. What is the probability that a meteorite that reaches the surface of Earth will hit land? What is the probability that it will hit water?
GEOMETRY
Gordon's outdoor fountain is in the shape of the lower half of a sphere. If the diameter of the hemisphere is 12 inches, what volume of water does the fountain hold to the nearest cubic inch?
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A carpenter has a wooden dowel that is 72 cm long. She wants to cut it into two pieces so that one piece is 5 times as long as the other. What are the lengths of the two pieces?
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