среда, 1 марта 2017 г.

Lesson 2. Angles

Acute, obtuse, reflex and right angles.

An acute angle is less that a 1/4 turn (90)
A right angle is a 1/4 turn (90)
An obtuse angle is more that a 1/4 turn (90) and less that a 1/2 turn (180)
A reflex angle is more that a 1/2 turn (180)
Labels for angles.

This is called angle BCD or angle DCB. We write this as
Angles on a straight line and angles at a point.

EXAMPLE:

The angles on a straight line add up to 180.
EXAMPLE:

The angles at a point add up to 360.
Vertically opposite angles and angles in a triangle.

EXAMPLE:

When 2 lines intersect the opposite angles are equal. Ie, vertically opposite angles are equal.
x = 42 

Test lesson 2

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