Draw every matching fold
Draw, compare and fold geometric figures to understand their defining properties.
Explore this lesson →6 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- A line of symmetry is a fold line that brings every part of the picture onto a matching partner. Imagine folding a paper heart down its middle: its two curved sides meet.
- Equal-sized halves are not enough: their corners, edges and decorations must land in matching places when folded on that particular line.
Something to notice
Ask the learner to draw a fresh ray and perpendicular line with a straightedge, explain why a tilted square keeps its names, and predict then test folds with paper. Digital construction and preview do not establish unaided physical drawing, folding or fresh transfer. Record those observations separately.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 4 · 4.G · US Common Core
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.