Shape Detective Worksheet
Shape Detective
Triangle Strength Lab
Name:
Date:
Part 1: Triangle Hunt
Circle every triangle you see in these strong structures!
Playground Set
Truss Bridge
House Roof
Tower Crane
Part 2: My Strong Structure
Draw a picture of a structure you saw today. Don't forget the triangles!
Drawing Zone
Bridge Builders Slides
Bridge Builders
Triangles: The Strongest Shape
The Squish Test
Square Model
What happens when we push the corners?
Triangle Model
Does it change its shape?
Engineering Secrets
Embedded media
Watch closely: Why did the flat bridge fall?
Triangle Power!
FORCE
When you push the top point...
The sides push down, and the bottom stretches. It stays strong!
Look for "Trusses"
A truss is just a long line of triangles working together.
Your Mission
Become a Shape Detective!
🚶♂️
Walk
Explore the school
👀
Spot
Find hidden triangles
⭕
Circle
Mark them on your sheet
Where are the Triangles?
Playgrounds
Bridges
Engineers use triangles everywhere!
Bridge Builders Teacher Guide
Teacher Facilitation Guide
Lesson: Bridge Builders (Grade 1)
Duration
45 Minutes
Objective
Students will identify triangles in real-world engineering and explain that triangles are "strong" because they don't easily change shape.
Materials
- Straws & Pipe Cleaners
- Clipboards & Pencils
- Shape Detective Sheet
- Marshmallows/Toothpicks
Key Vocabulary
Engineer
A person who designs and builds things.
Truss
A framework made of triangles.
Stable
Strong and unlikely to fall or change.
1. Warm-up: The Squish Test
5 MIN
Preparation: Pre-make models using straws and pipe cleaners (one square, one triangle) for each small group.
Instruction: Have students gently press down on the top corner of the square. Note how it shifts into a rhombus. Then, have them press the top point of the triangle.
"Which shape stayed strong? Why do you think that is?"
2. Video Viewing: Bridge Secrets
5 MIN
Watch SciShow Kids: Bridge Strength (1:45 - 2:29).
Discussion Prompt (Pause at 2:10): "Look at that triangle animation. Where does the weight go when Jessi pushes the top? It spreads out to the sides and bottom!"
3. Shape Detective Walk
15 MIN
Distribute clipboards and worksheets. Lead students on a walk through the school, focusing on:
- Playground equipment (A-frame swings)
- Roof lines of nearby buildings
- Cell towers or high-voltage lines visible from windows
- Staircase supports
4. Closure & Sharing
5 MIN
Have students share one place they found a triangle. Emphasize that engineers don't use triangles just for looks—they use them for strength.
Extension: Triangle House
Challenge students to build a 3D house using only triangles made of toothpicks and marshmallows. See if it can hold a small toy car or heavy book!