9. Shapes and angles

9.01 Points, lines and rays

9.02 Angles within a circle

9.03 Angles and angle types

EXPLORE: Draw angles

9.04 Right angles

9.05 Estimate angles

9.06 Measure and compare angles

9.07 Angles on a straight line

9.08 Angles at a point

9.09 Classify 2D figures

United States of America UT

Grade 4

9.02 Angles within a circle

Interactive practice questions

How many $1^\circ$1° angles fit into a full circle?

Easy

< 1min

How many $1^\circ$1° angles fit into a $20^\circ$20° angle?

Easy

< 1min

A $1^\circ$1° angle is turned $8$8 times. What is the size of the angle that is formed?

Easy

< 1min

A $1^\circ$1° angle is turned $34$34 times. What is the size of the angle that is formed?

Easy

< 1min

Outcomes

4.MD.5

Recognize angles as geometric figures that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:

4.MD.5.a

Understand that an angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a "one-degree angle," and can be used to measure other angles.

4.MD.5.b

Understand that an angle that turns through n one-degree angles is said to have an angle measure of n degrees.

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