Right, there are four different types of triangle. First, here's an isosceles triangle, it has two equal length sides and two equal ... that add up to 180°, no matter the type of triangle.

The sides of right-angled triangles ... divided by the hypotenuse for each triangle is 3/5 and 6/10. These two fractions are equivalent and both equal 0·6. No matter how much the triangle is ...