math and science education search Mr. R.'s world of math and science free and accessible educational resources for all




When lines intersect,
And sometimes they might,
Angles are formed,
Some wrong and some RIGHT,
Angles are special,
They have different types,
Right, and obtuse,
Acute ones are nice...
Angles can't angle,
Which means they can't fish,

And angles can't whistle,
Or grant you a wish...
Angle's no ANGEL,
Or circle or sphere,
But they do come in handy,
When building, my dear...
Three measures of angles,
For all sorts of needs,
Angles are formed,
When bending your knees...
Surrounded by angles,
I think what I've found,
Without these 3 angles,
Life would be round...


obtuse angles measure more than 90º

acute angles measure less than 90º

right angles measure exactly 90º

Math Challenges
What type of angles do you see on this triangle?

equilateral triangle

What type of angles do you see on this rectangle?


Listen to Mr. R.'s geometry songs!
geometry songs

Watch Mr. R.'s geometry videos!
geometry videos


join me on Youtube


Custom Search
copyright Mr. R. 2014