A square marked at a vertex shows an angle that is exactly 90°. Image caption, The longest side of a triangle is opposite the largest angle. The shortest side of a triangle is opposite the ...

Image caption, For a right-angled triangle, the base and the perpendicular height are the two sides that are at right angles. The perpendicular height is the perpendicular measurement that gives ...

(typical responses: size, all triangles, all coloured, all have three sides, all pointed the same way (orientation), all have angles). 2. After the initial discussion about the static triangle images, ...