Earth Day Challenge: Measure a Tree!

Shh… Mama Earth doesn’t know we’re measuring her tallest green kids! Grab some cardboard, a coin, and a string, and help us estimate the height of a tree—no climbing required. Celebrate Earth Day with a little DIY science and a lot of fun!

✂️ Build Your Clinometer

You’ll need: cardboard, protractor, ruler, pencil, string, tape, small weight (like a coin).

Quick steps:

Trace your protractor onto cardboard

Mark a few angles (0°, 45°, 90° is enough!)

Cut it out and poke a hole at the center

Tie string through the hole and attach a coin

✅ When you hold it up, the string should hang straight down

EXAMPLE WITH ADDED INSTRUCTIONS PLUS PHOTOGRAPHIC AIDS

🌳 Measure Your Tree

1. Stand back and measure your distance from the tree

2. Measure your eye height (ground → your eyes)

3. Find your angle

   • Hold the clinometer at eye level

   • Look at the top of the tree

   • Read the angle where the string points

🧮 Quick & Easy Math

Step-by-step:

1. Subtract your measured angle from 90°

   • Example: 90 − 35° = 55°

2. Find the tangent (tan) of that number on a calculator

   • Example: tan(55°) ≈ 1.43

3. Multiply by your distance from the tree

   • Example: 1.43 × 10 m = 14.3 m

4. Add your eye height

   • Example: 14.3 + 1.6 = 15.9 m

✅ That’s your tree’s height!

📸 How to Enter

Submit a multi-image deviation with:

• Your clinometer

• The tree you measured

Comment your entry below 👇
No AI-generated images

📅 Deadline

May 15th, 2026
Winners announced May 20th

🏆 Prizes

🥇 1000 points + Hype badge
🥈 750 points
🥉 500 points

📌 Rules

• Follow all group + DeviantArt rules

• Must be a member of @CRArtisanCrafts to win

• Admin decisions are final

Thank you to @moonbeam13 for her help in managing this challenge.