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AB: required BC: required

MB: required ON: required

Teacher Resource 6.1 Unit 6 Geometry pp. G-12–16

New Canadian Edition

JUMP Math™ Copyright © 2018 JUMP Math

G6-3

Estimating Angles

Students will:

• estimate angle measures using benchmark angles and draw angles using estimation.

AP Book 6.1 pp. 98–99

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See p. G-12 for details.

Let's review measuring angles.

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See pp. G-12–13 for details.

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c)

a)

b)

Exercises:

What is the measure of the angle?

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See p. G-13 for details.

We can use the grid to estimate angles.

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See p. G-13 for details.

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Exercises:

Copy the angle. Estimate the measure of the angle, then measure the angle to check your estimate.

a)

b)

c)

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See pp. G-13–14 for details.

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See p. G-14 for details.

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c)

b)

a)

Exercises:

Estimate the measure of the acute or obtuse angle. Then subtract to estimate the reflex angle.

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Reflex Angles

​

  1. Measure INNER angle (the obtuse or acute angle)
  2. Subtract that from 360 to find the reflex (outter) angle
  3. Example: if the acute angle is 40 degrees go:

360 - 40 = 320

​

Formula for Reflex angle:

​

360 degrees - inner angle = reflex angle

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We can use estimation to draw angles.

See p. G-15 for details.