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Activity
Maths Challenge

Maths challenge.net: Triangle in a Square

For Students 9th - 10th Standards
A "three star" geometry problem requiring some prior knowledge in math and proofs to maximize the area of an inscribed triangle in terms of the hypotenuse.
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Activity
Maths Challenge

Maths challenge.net: Maximum Square

For Students 9th - 10th Standards
A challenging proof like geometry of finding the square inscribed in a triangle.
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Activity
Maths Challenge

Maths challenge.net: Lunes

For Students 9th - 10th Standards
A "three star" geometry problem where some experience of math problem solving skills and knowledge of circles is recommended to solve this lunes (parts of a circles) area problem
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Activity
Maths Challenge

Maths challenge.net: Tick Tock Triangle

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior knowledge of probability is required to solve this "Tick Tock Triangle" problem, have fun!
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Activity
Maths Challenge

Maths challenge.net: Bag of Balls

For Students 9th - 10th Standards
A "three star" geometry problem which requires prior math problem solving skills and proof writing skills to solve this "Bag of Balls" radius of balls problem.
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Activity
Maths Challenge

Maths challenge.net: Shaded Triangle

For Students 9th - 10th Standards
A great geometry problem of area, encorperating many learned skills.
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Activity
Maths Challenge

Maths challenge.net: Circumscribed Triangle

For Students 9th - 10th Standards
Find the area of this circumscribed triangle with your geometry skills.
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Activity
Maths Challenge

Maths challenge.net: Annulus

For Students 9th - 10th Standards
An annulus of a circle is defined and then a proof like problem is posed involving area and radius of circles.
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Activity
Maths Challenge

Maths challenge.net: Rectangular Circles

For Students 9th - 10th Standards
An area problem involving finding the area of a rectangle and a circle. The problem may be made into a general proof as well.
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Activity
Maths Challenge

Maths challenge.net: Equal Angles

For Students 9th - 10th Standards
A geometric proof. Prove two angles in this model are equal in measure.
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Activity
Maths Challenge

Maths challenge.net: Sloping Square

For Students 9th - 10th Standards
A geometry problem of finding the area of a sloped square within a square.
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Activity
Science Buddies

Science Buddies: Throwing You Some Curves: Is Red or Blue Longer?

For Students 6th - 8th
This a straightforward, but interesting, project in geometry. It is a good first proof to try on your own. You should be able to figure it out by yourself, and you'll gain insight into a basic property of circles.
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Website
University of Saskatchewan (Canada)

University of Saskatchewan: Emr: Exercises in Math Readiness

For Students 9th - 10th
The University of Saskatchewan offers this resource for the review of mathematical concepts that students need to enter university level math courses. Topics include mental arithmetic, algebra, geometry, trigonometry, exponential and...
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Lesson Plan
Science Buddies

Science Buddies: Circumscribing a Circle About a Triangle

For Teachers 9th - 10th
Here is a project that combines Computer Science and Mathematics. Prove a method for circumscribing a circle about a triangle (as shown). You'll also learn how to create an interactive diagram to illustrate your proof, using an applet...
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Lesson Plan
Science Buddies

Science Buddies: Tangent Circles and Triangles

For Teachers 9th - 10th Standards
Here is a project that combines Computer Science and Mathematics. The two circles are tangent to one another at point A. Their diameters are parallel. Prove that points A, D and F are co-linear. You'll also learn how to create an...
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Lesson Plan
Science Buddies

Science Buddies: Circles, Tangent Lines and Triangles

For Teachers 9th - 10th Standards
Here is a project that combines Computer Science and Mathematics. The semicircle has two tangent lines that meet at point T. You need to prove that a line drawn from A to T bisects CD. You'll also learn how to create an interactive...
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Unit Plan
CK-12 Foundation

Ck 12: Flex Book: Pythagorean Theorem

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Learning module that introduces students to the Pythagorean Theorem. Topics include history, applications, and proofs related to this geometry concept.
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Unit Plan
Oswego City School District

Regents Exam Prep Center: Pythagorean Theorem

For Students 7th - 9th Standards
Material to supplement introductory instruction on the Pythagorean Theorem. A very simple look at its use in geometry, a multiple-choice quiz through which students can test themselves and check their answers, and a teacher resource...
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Activity
Maths Challenge

Maths challenge.net: Odd Vertices

For Students 9th - 10th Standards
A "three star geometry problem" requiring knowledge of how to complete geometric proofs. The problem explains what the order of a vertex is and asks for the proof of a generalization.
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Activity
Maths Challenge

Maths challenge.net: Platonic Solids

For Students 9th - 10th Standards
A "three star geometry problem" requiring knowledge of how to complete geometric proofs to prove that there are no more than five regular convex polyhedra.
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Activity
Maths Challenge

Maths challenge.net: Peculiar Perimeter

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior math problem skills and proof experience is recommended. Tile constructions may be used to solve this perimeter and area problem.
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Activity
Maths Challenge

Maths challenge.net: Quadrilateral Parallelogram

For Students 9th - 10th Standards
A "three star geometry problem" requiring knowledge of how to complete geometric proofs and some prior math knowledge. This problem asks to prove that the mid points of any quadrilateral form a parallelogram.
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Activity
Maths Challenge

Maths challenge.net: Coloured Strings

For Students 9th - 10th Standards
A "three star geometry problem" - requiring the knowledge of what a cuboid is and a some knowledge of how to do proofs.
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Activity
Maths Challenge

Maths challenge.net: Parallelogram Property

For Students 9th - 10th Standards
A "three star geometry problem" requiring knowledge of how to complete geometric proofs properties of parallelogram.

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