Right angle

High school (ages 12+)
Mathematics & Numbers

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/right-angle

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the angle measurement?A right angle measures exactly 90 degrees
2. What is the perpendicularity?Lines that intersect to form a right angle are called perpendicular
3. Why are right angles important in buildings?Builders use right angles to make walls straight and stable, so houses, bridges, and skyscrapers stay strong.
4. How did ancient people use right angles?Egyptians and Greeks used tools like the groma to draw straight, perpendicular lines for foundations and walls, keeping their monuments solid.

Euclidean Geometry: The study of plane and solid figures based on axioms and theorems, originating from Euclid's Elements.
Perpendicular: Two lines or planes that intersect at a right angle (90 degrees).
Cartesian Coordinate System: A system that uses perpendicular axes (x and y) to define points in a plane.
Trigonometry: The branch of mathematics dealing with the relations between the sides and angles of triangles.