Jiangsu Education Edition Fourth Grade Mathematics Volume 1

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"Measurement of Angles" PPT Courseware 4

How do you measure the size of an angle?

What unit is used to measure the size of an angle?

Do you know a protractor?

How to measure angles with a protractor?

Divide the semicircle into 180 equal parts. The size of the angle subtended by each part is 1 degree, recorded as "1°"

song decision

Point to point, line to edge,

Look at the other side,

Distinguish between inside and outside,

0 is outside, read the outer circle,

If 0 is included, read the inner circle.

The size of an angle is related to the length of its sides (it has nothing to do with it). The size of an angle is related to the size of its two sides (the spread). The greater the spread between the two sides, the larger the angle.

1. Look at the protractor and see how big 30° 45° 60° 90° 120° is.

2. Measure the degrees of each of the angles below.

∠1 = 55° ∠2 = 55° ∠3 = 110° ∠4 = 40° ∠5 = 110°

3. First estimate the degrees of each angle on the triangle ruler, and then measure the degrees of each angle.

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"Angle and the Measurement of Angle" PPT courseware 2:

"Angle and the Measurement of Angle" PPT courseware 2 1. Xiao Ming's house is 5 kilometers away from the school, Xiao Hong's house is 2 kilometers away from the school, Xiao Ming's house, Xiao Hong's house, and the school are on a straight line, then Xiao Hong's house is _ _____km? 2. When farmers dig canals, they first erect posts and pull wires at both ends.

"Angle and the Measurement of Angle" PPT courseware:

"Angle and the Measurement of Angle" PPT courseware Learning objectives of this section: 1. Two definitions of angle and three ways to express angle. 2. The measurement unit of angle and the conversion of angle. The image of angle in life! What is an angle? ? There are many examples related to angles in life. Observe the picture below. Can you point out...

"Measurement of Angles" PPT courseware 4:

"Measurement of Angles" PPT Courseware 4 1. Unit of Measurement of Angle One-360th of a circumferential angle is an angle of 1 degree, and is recorded as 1. One-sixtieth of 1 is 1 point, and is recorded as 1, that is, 1=60 One-sixtieth of 1 is 1 second, and is recorded as 1, that is, 1=60. The measurement units of angles are degrees, minutes, and seconds, which are six...

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Update Time: 2024-09-03

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