Challenging perimeter problem

Perimeter of rectangle covered by 9 non-overlapping squares. From 200) American Invitational Math Exam

Area of an equilateral triangle

Finding the formula for the area of an equilateral triangle with side s

Area of diagonal generated triangles of rectangle are equal

Area of Diagonal Generated Triangles of Rectangle are Equal

Interesting perimeter and area problems

Three example problems involving perimeter and area

Triangle area proofs

Proving that the area of any triangle is 1/2 b x h