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# Geometry Test 4th G

### Geometry

How do you find the perimeter of a two-dimensional shape? Add up all of the sides. Perimeter is the distance AROUND the outside of a figure. Measured in units.
How do you find the area of a two-dimensional figure? Count the number of square units on the inside of the figure. If the figure is a SQUARE or RECTANGLE you can multiply the length and the width. Measured in square units.
How do you find the volume of a three-dimensional object? Volume is the number of CUBIC UNITS on the inside of a 3-d shape. If it is a CUBE or RECTANGULAR PRISM you can multiply the length X width X height. Measured in cubic units
What is volume? How many cubic units it takes to fill a 3-dimensional object.
What is area? The space covering a 2-dimensional object. The number of square units on the inside of a 2-d shape.
What is perimeter? The distance around the outside of a 2-dimensional shape. The number of units when you add up all the sides.
Triangle with no equal sides. All sides are different lengths. Scalene
Triangle with all equal sides. All sides are the same length and all angles are the same. Equilateral
Triangle with two equal sides. Isosceles
Triangle with all acute angles. Acute
Triangle with one right angle. Right
Triangle with one obtuse angle. Obtuse
An angle less than 90 degrees acute
An angle greater than 90 degrees obtuse
A angle exactly 90 degrees right
a line that goes on forever on both sides line
a line that has one endpoint and goes on forever in one direction ray
a line that has two endpoints line segment
What is a polygon? A closed figure with straight sides.
What is the difference between a pyramid and a prism? Pyramids come to a point. They have no parallel faces. Prisms have a congruent top and bottom (bases) they have parallel faces.
Name three solid figures. (3-dimensional shapes) cube, rectangular prism, pyramid, cone, cylinder
What is the face of a 3-d object? Flat side
What is the edge of a 3-d object? Where two faces meet
What is a vertex (what are vertices)? Corners, where two lines meet or two edges meet in a 3-d object.
Is a circle a polygon? Why or why not? No-it has curves.