Quadrilateral Proofs Worksheets
How to Write Quadrilateral Proofs  When it comes to math, you have to be able to prove that what you're doing is correct. When it comes to geometry, it is the same. In geometry, you'll often be asked to prove that a certain shape is, indeed, that certain shape. For example, you might be shown a quadrilateral and be asked to prove that it is a parallelogram. Remember that a quadrilateral is a foursided flat shape. A parallelogram is a quadrilateral with two pairs of opposite, parallel sides. Looking at this shape, you might think that it is a parallelogram, but unless the problem specifically tells you and/or you can prove that it is, you can't say for sure that it's a parallelogram. This is where mathematical proofs are very important. You can only say for sure that this is a parallelogram with a mathematical proof. Most times, when you're asked to prove that a certain quadrilateral is a parallelogram, you'll be given information about just a few sides. It's then your job to prove that these sides have the right properties of a parallelogram. We will be taking a closer look at this in a little bit.

Intermediate Lesson
Demonstrates how to use advanced skills to tackle Quadrilateral Proofs problems.
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Independent Practice 1
A really great activity for allowing students to understand the concepts of the Quadrilateral Proofs.
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Independent Practice 2
Students use Quadrilateral Proofs in 20 assorted problems. The answers can be found below.
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Homework Worksheet
Students are provided with 12 problems to achieve the concepts of Quadrilateral Proofs.
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Funny Sayings
I bet you do not know what this phrase means: one, one,
one, one, one, one, another, another, another, another, another, another.
Answer: six of one and half a dozen of another!