How Tall Is That Tree?
Trigonometry is a branch of maths that relies on the relationships between the angles and sides of triangles. This activity uses trigonometry to estimate the heights of tall objects, by making a simple tool that can measure angles.
Key Stage
THREE 
Age
11-14 
Learning
Maths, geometry, making observations, curiosity 
Time
30 mins 
Difficulty
HARD 
Materials
protractor template
A4 paper
A6 paper
measuring tape
scissors
sticky tape or glue
hole punch
50cm of string
Metal washer
large button
keyring with something on it or other small weight that can be tied with string