Skip to lesson

Choose “Save as PDF” in the print dialog to keep a copy.

Cogito

Grade 4 Math · Chapter 7 · Lesson 2

Practice Worksheet

Naming and Measuring Angles

Acute, right, obtuse, straight.

10 problems · about 15 minutes · 4.MD.C.6

NameDate

Figure — use these to answer the problems

Set an angle and read the protractor. The name appears below.
0306090120150180120°
Turn in degrees120
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “An Angle Is a Turn”

    How many degrees is a half turn?

    Answer

  2. From “Decimals and Money”

    How many cents is $0.35?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. Is 75 degrees acute or obtuse?

    • Acute.
    • Obtuse.

  2. Why estimate before reading the protractor?

    • It catches a reading off the wrong scale.
    • It is faster.

  3. Is 30 degrees acute or obtuse?

    • Acute.
    • Obtuse.

  4. Is 100 degrees acute or obtuse?

    • Obtuse.
    • Acute.

Build It Up

The same ideas with more to keep track of.

2 problems

  1. How many degrees is a straight angle?

    Answer

  2. How many degrees is a right angle?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

2 problems

  1. The Name

    An angle measures 55 degrees. What type is it?

    • Acute.
    • Obtuse.

  2. The Other Name

    An angle measures 135 degrees. What type is it?

    • Obtuse.
    • Acute.