Using only elementary geometry, determine angle x. Provide a step-by-step proof.
You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.). You may not use more advanced trigonomery, such as the law of sines, the law of cosines, etc. There is a review of elementary geometry below.
This is fairly hilarious to math geeks. It assigns a piano key with a value and plays "pi" to 1,000 places. It's quite beautiful ; )
Tests understanding of acute, obtuse, right, and vertical angles. (see comment for details)
This is a great web site if you are interested in helping your students see their work in math connected to the real world. While it is not a website that students can work on alone, it provides information and resources that you can work into an incredible lesson. is one that you can incorporate into a larger lesson.
This online tool allows students to visually explore the relationship outlined in the Pythagorean Theorem.
This resource provides countless math tools for kindergarten through high school teachers.
A succinct and clear exposition of geometry. Enjoyable:4/5. Interesting: 5/5. Learn: 5/5 if you are looking to learn geometry.
This resource is an excellent tool for tenth graders when introduced with transversals,
obtuse angles, acute angles, and when tenth graders are doing proofs. Furthermore,
teachers can have a field day with this applet when teaching this topic, and looking
for ways to explain the definitions of certain mathematics terms.
Rating:
Enjoyable - 2
Interesting - 3
Learn- 4
Choose the number of polygons to approximate the area of a circle.
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Using only elementary geometry, determine angle x. Provide a step-by-step proof. You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.). You may not use more advanced trigonomery, such as the law of sines, the law of cosines, etc. There is a review of elementary geometry below.
Tests understanding of acute, obtuse, right, and vertical angles. (see comment for details)
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