Angles

Practice 3 items →

An angle is a turn; degrees are the unit of turn. Students name ray, vertex, and angle, measure and draw with a protractor, classify acute, right, obtuse, straight, and reflex angles, and use angles on a line and at a point.

Specification · for a parent or teacher

Part no.: angle-measure-types
Course: Advanced Math 4 · Unit 15
Realm: Shapes
Difficulty: 1 of 4 — Grade 4 fluency. One idea, one step.
Qty: 3 items

Part no. is the node's id; the realm is the kind of math; qty is how many practice items it carries.

Students can

name ray, vertex, angle; measure and draw with a protractor; classify acute, right, obtuse, straight, reflex; use angles on a line ( $180^\circ$ ) and at a point ( $360^\circ$ ).

Ready when

two adjacent angles on a line, one labeled $127^\circ$ , the other found without measuring.

Formulas

Angles on a line

\text{angles on a line} = 180^\circ

Angles at a point

\text{angles at a point} = 360^\circ

Watch for

reading the wrong protractor scale; calling $90^\circ$ acute; reflex angles ignored.

Before · requires

— none

After · used by

Lines and shapeslines-symmetry-quadrilaterals · Math 4
Geometry and angle theoremsangle-theorems-triangles · Math 5

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