Description

Scratch Mathematics – 13

Welcome to Scratch Mathematics – 13! This set continues our hands‑on journey through slopes, lines, and triangle centers—each as a bite‑sized, interactive Scratch game.

Scratch Mathematics – Course Lessons

Lesson 241 – Rate of Change & Prediction A 17-slide mini-course: quick stories + solved examples that turn slope into real-world forecasting.	Lesson 242 – Point + Slope Place point Q so the segment through P matches the given slope; instant visual feedback on a −9…9 grid.	Lesson 243 – Find the Missing Coordinate One value is hidden as z; use slope or perpendicular clues to recover it and check your answer.
Lesson 244 – Equations of Lines Decode clues about slopes, points, and intercepts to uncover the hidden equations of mysterious lines!	Lesson 245 – Smart Choices with Lines Compare real-life plans and pricing models using linear equations to find which one gives the better deal.	Lesson 246 – Perpendicular Bisectors Discover how to find the line that perfectly divides a segment in half and stands at a right angle to it.
Lesson 247 – Triangle or Not? Decide whether three given lengths can form a triangle by applying the triangle inequality rule!	Lesson 248 – The Impossible Side Identify which side length breaks the triangle inequality and makes a triangle impossible!	Lesson 249 – Triangle Range Quest Find the missing boundary that keeps the triangle possible!
Lesson 250 – Triangles in Egypt Discover how Egyptians used knotted ropes to form triangles.	Lesson 251 – Triangle Testers Test whether three points form a triangle or line up straight using the collinearity rule.	Lesson 252 – Construct a Perpendicular Segment Learn how to construct a perpendicular line using only a compass and straightedge.
Lesson 253 – Point-to-Line Distance Find the perpendicular distance from a point to a line and reveal the solution with Tera!	Lesson 254 – Distance Between Parallel Lines Find how far apart two parallel lines are using the perpendicular distance formula!	Lesson 255 – Line Maker Drag two stars on the grid to create a line—watch Tera instantly reveal its equation!
Lesson 256 – Triangle Measure Use the distance formula to find the lengths of all three sides of a randomly generated triangle on the grid.	Lesson 257 – Chaos in Order Watch random jumps magically form the Sierpiński triangle through the power of simple rules and repetition!	Lesson 258 – The Circumcenter Story Discover how the three perpendicular bisectors of a triangle meet at one special point—the circumcenter!
Lesson 259 – The Incenter Story Discover how the three angle bisectors of a triangle meet at one special point—the incenter, the center of its incircle!	Lesson 260 – The Centroid Story Discover how the three medians of a triangle meet at one perfect balance point—the centroid!