*precisely*.

We tend to say

*square*or

*rectangular*when we are talking about 3D objects, even when we mean

*rectangular prism*. I was talking with my friend Chris, who said he was putting

**in his back yard. I knew the word**

*square gabions***meant a**

*gabion**big wire cage*, but I didn't know what shape they might be. I learned

*can be purchased as rectangular prisms, cylinders or cubes. You put them in place, then fill them with heavy material to form earthen walls.*

**gabions**If we want to be extra-precise, gabions aren't

*solid*figures until they unfolded and filled. Here are some pictures of his empty ones, waiting for 2 tons of dirt. We'll do the math calculations on the dirt in another blog:**Radius**straight line from the center point of a circle to any point on the circle**Ray**line with one endpoint**Rectangular Prism**solid figure with 8 vertices, 12 straight edges and a total of 6 rectangular flat faces, one of which is the base**Rectangular Pyramid**solid figure with 5 vertices, 8 straight edges, 4 triangular flat faces and 1 rectangular base**Reflection**movement of a figure over a line that results in a mirror image; a Flip**Remainder**amount left over when one number is divided by another**Right Angle**angle that measures exactly 90 degrees**Roman Numerals**number system created by ancient Romans that uses letters rather than numerals; not based on place value**Rotate**to move or turn a figure around a point; a Turn**Round**(1) a circular or cylindrical shape**Round**(2) replacing an exact number with an approximate number that is more convenient to use

**Scalene Triangle**a triangle where all three sides are of different lengths**Similar Figures**figures having the same proportions but not the same size**Slide**when a figure moves without changing its appearance, see translation**Sphere**3D solid figure where all points on the surface are equidistant from the center**Square**2D parallelogram with 4 congruent sides and 4 congruent angles**Square Pyramid**3D solid figure with a total of 5 vertices, 8 straight edges, 4 triangular faces and a square base**Square units**(1) group of squares with sides one unit in length, which are laid on top of an object to measure its area**Square units**(2) a unit of distance when multiplied by itself becomes a measure of area**Surface area**the sum of the areas of all the faces of a three-dimensional figure

**Three-Dimensional Figures**3D geometric objects with length, width and height; they are “solid”**Translation**when a figure moves without changing its appearance, see slide.**Triangular Prism**3D figure with 6 vertices, 6 straight edges, 3 rectangular flat faces and 2 triangular flat faces**Triangular Pyramid**3D figure with 4 vertices, 6 straight edges, and 4 triangular flat faces**Turn**to make a figure revolve around a point, Rotate**Two-Dimensional Figures**2D geometric objects with only length and width; they are “flat”

**Vertex**point where at least two straight lines meet (flat figures) or three straight edges meet (solid figures); plural is vertices**Volume**measurement of the amount of space occupied by material; expressed in cubic units

**Week**period of time consisting of 7 days; not related to solar or lunar activity**Weight**measurement that describes how heavy an object is; due to earth's gravity

**Yard**unit of length equalling 3 feet; 36 inches; .9 meters**Year**time period of 365-366 days or 12 months; based on rotation of Earth around the sun

**Zero Property: Addition**any number added to zero has itself as the sum**Zero Property: Multiplication**any number multiplied by zero has a product of zero

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