Parallelograms
What is the formula for a parallelogram?
Area = Base * Height
What is the Area formula for a triangle?
Area = 1/2 * Base * Height
Polygons are ___-dimensional figures
2-dimensional
polyhedra are __- dimensional figures
3-dimensional
Surface Area measures the area of the _________ of a 3-dimensional figure
Surface
Name three different parallelograms.
Answers may vary (Squares, rectangles, rhombuses, etc.)
What do we call a triangle that has a 90 degree angle?
Right Triangle
Sides of a polygon must be ____________, with no curves anywhere
Straight
Polyhedra faces must be ____, with no rounded areas.
flat
What are the three dimensions seen on 3-dimensional figures that help us find surface area?
Length, Width, Height
What is the area of a parallelogram with a base of 4 feet and a height corresponding to the base of 7.5 feet?
30 square feet
A triangle is exactly one-half of a ___________.
Parallelogram
Two lines meeting at one point on a shape is called a ______.
Vertex
Corners of polyhedra are to vertices as lines on polyhedra are to _________.
Edges
Surface area is measured in _________ units.
square
Parallelograms are made up of two equivalent _________, a _________ is exactly half of a parallelogram
triangles; triangle
What is the area of a triangle with a base of 6 cm and a height corresponding to the base of 8 cm
24 square cm
A = 1/2 * B * H
A= 1/2 * 6 * 8
A= 1/2 * 48
A=24 square cm
Polygons cannot have any openings to inside the figure- polygons must be _________.
Closed.
A square is not a polyhedron, because it is not __________.
3-dimensional
What is the surface area of a cube with a side length of 4 ft. ?
96 square feet
We have a parallelogram with an area of 42 square centimeters, and a height corresponding to the base of 7 centimeters. How much is the base?
6 centimeters
Area= Base * Height
42 = Base * 7
42/7 = Base = 6
I have a triangle with an area of 15 square feet, and a height corresponding to the base of 6 feet. What is the Base?
Base = 5 feet
A= 1/2 * B * H
15= 1/2 * B * 6
15 = 3 * B
15/3 = Base
A circle is NOT a polygon, because it is _________.
Curved.
True or false; polyhedra always have more vertices than edges
False
A net with two bases shaped like triangles, and surrounded by rectangles will assemble into what 3-dimensional shape?
Triangular Prism