BasicMathSkills AddSubtractDecimals InverseOperations
ComplementarySupplementary MultiplyDecimals NumberProperties
item8 Exponents OrderofOperations-GEMA1
VerticalAngles FactorTrees item3
AreaofPolygons Fractions ProportionsRatios
AreaofParallelogram AddSubtractFractions Quadrilaterals1
AreaofRectangle multiplyfractions RationalNumbers
AreaofSquare dividefractions SieveofEratosthenes
AreaofTrapezoid lowesttermsfractions
AreaofTriangle mixednumbers
CirclesandPi Integers ClassNews
Circumference AddSubtractIntegers item24
AreaofCircle MultiplyDivideIntegers item17
Angles (not angels)
Let's Practice!


To practice the vocabulary from elementary, click Angles Review practice page.

©2009–2016 Sherry Skipper Spurgeon.

All Rights Reserved.

What is an angle? An angle is often defined as a figure where two rays share a common endpoint (vertex). In elementary school you learn about acute, obtuse, and right angles. In middle school, we go further with the development of angles and you'll see just how totally cool these things really are!

Vocabulary Review

protractor: tool used to measure angles. Angles are measured in degrees.

The angle is the 'opening' or arc. (Note: If you need a protractor, click download protractor.)


right angle: an angle that measures exactly 90°. A little square that connects the two 'legs' of the angle indicate that an angle measures exactly 90°.


acute angle: an angle that measures less than 90°. An arc connects the two 'legs' to indicate the measure of the angle.

obtuse angle: an angle that measures greater than 90° but less than 180°. An arc connects the two 'legs' to indicate the measure of the angle.


vertex: a point where two rays meet in an angle

ray: a part of a line that has an endpoint and continues in one direction


Now, we're going to take the vocabulary you already know and add to it. Then, using logical thinking skills, we'll see what you math problems you can figure out simply from 'knowing the math.'

Moving on, let's go to some more angles, shall we? Next page