Working with Sketch 3 Project Sketch 3 on the screen and ask the students to explore which coloured triangles could fit into the given triangle outlines. For this sketch, all the outlines look like ...

Working with Sketch 5 Project Sketch 5 on the screen. Introduce the term scalene (pink triangle) and equilateral (outline). Have one student drag the scalene triangle to review its properties. Have ...

Video summary At the Grecian Pizza Parlour, apprentice Ambrose receives an order for 50 equilateral triangle shaped pizzas with equilateral triangle shaped toppings. Ambrose uses the circular base ...

Show answer Interior angles of equilateral and isosceles triangles The sum of interior angles in a triangle is 180˚. In an equilateral triangle, all three angles are equal to 60˚.

As a new episode of the fantastic YouTube channel Numberphile explores, the Platonic solids made of equilateral triangles start to do some bizarre things when you attempt to cram in more triangles.

Leonardo da Vinci, the famous Italian polymath who painted the Mona Lisa, had a sophisticated geometric understanding way ...