Maths challenge.net: Triangle Area

Need an activity for teaching the Pythagorean Theorem? Geometry juniors apply the Pythagorean theorem to two triangles to determine a final calculation. 

Combine algebraic and geometric strategies to find solutions. The task asks learners to find the coordinates of a third vertex of a triangle to create a triangle with a specific area. The project is a set of seven problems that...

While the instructional activity focuses on right triangles, this activity offers a great way to practice the area of all triangles through an interactive webpage. The activity begins with the class taking a square paper and cutting in...

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.

Find the area of this circumscribed triangle with your geometry skills.

A challenging proof like geometry of finding the square inscribed in a triangle.

A great geometry problem of area, encorperating many learned skills.

Use your triangle solving skills to solve this triangle problem and then apply it to the real world.

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

A lune of a circle is defined and a problem of finding the area of two lunes is given.