https://explainstem.com/lessons/pythagoras.htmlhttps://explainstem.com/posters/pythagoras.jpgPythagoras’ TheoremSee why a² + b² = c² works for a right-angled triangle, then use it to find a missing side. A free visual GCSE Maths lesson.https://explainstem.com/media/showcase/pythagoras.mp4742026-10-19https://explainstem.com/lessons/angle-in-semicircle.htmlhttps://explainstem.com/posters/angle-in-semicircle.jpgAngles in a SemicircleUnderstand why an angle at the circumference subtended by a diameter is 90°. Watch the diagram and proof in this free visual GCSE Maths lesson.https://explainstem.com/media/showcase/angle-in-semicircle.mp4952026-10-19https://explainstem.com/lessons/quadratic-translations.htmlhttps://explainstem.com/posters/quadratic-translations.jpgQuadratic Graph TransformationsSee how changing y = x² moves a quadratic graph left, right, up and down. A free visual GCSE Maths lesson on translations.https://explainstem.com/media/showcase/quadratic-translations.mp41212026-10-19