angles

=__﻿Angles__=

Review Angle Facts
[|Angle types (interactive explanation)]
 * Acute
 * Obtuse
 * Reflex
 * Right Angle

3. Estimating them
[|Examples of drawing,measuring and estimating angles] A link to play estimating angles: http://nrich.maths.org/1235

Angles at a point
Angles around a point equal 360 degrees
 * Corners of a square rearranged to create angles around a point.
 * [[file:angles at a point.gsp]]

1. Vertically opposite
If a line is split into 2 and you know one angle you can always find the other one. 30° + 150° = **180°**
 * Angles on line equal 180 degree

Example: If we know one angle is 45° what is angle **"a"** ?

 * [[image:http://www.mathsisfun.com/images/angle45.gif width="188" height="110"]] || Angle **a** is 180° − 45° = **135°** ||

This method can be used for several angles on one side of a straight line.

Example: What is angle **"b"** ?
Sum of known angles = 45° + 39° + 24° Sum of known angles = 108° Angle **b** = 180° − 108° Angle **b** = 72° ||
 * [[image:http://www.mathsisfun.com/images/angleb.gif width="268" height="137"]] || Angle **b** is simply 180° less the sum of the other angles.


 * Given a line through, angles opposite each other will be equal

2. Perpendicular

 * constructing perpendicular bisector
 * constructing perpendicular.

3. Parallel lines

 * Alternate Angles




 * Corresponding Angles
 * Interior Angles
 * ====Worksheets====

Further links to:

1. Triangles

 * Angles in a triangle equal 180 degrees
 * Similar triangles
 * Drawing Triangles
 * What is the minimum information you need to draw a triangle (discussion)
 * Side, Angle, Side
 * Angle, Side, Angle
 * Side, Side, Side
 * How do you condtruct a triangle with this information (Exercises)


 * Trigonometry
 * Pythagoras

2. Quadrilaterals

 * Parallograms
 * square
 * rhombus

3. Polygons

 * Interior angles
 * Exterior angle
 * Worksheets

**4. Lesson plan additional sheets:**

 * 1. Polygon table
 * 2. Revision/consolidation worksheet



**5.Lesson Plans**
==
 * Medium term plan:**
 * Lesson plans:**

**6. Actual Lesson to follow**
[|Angle types (interactive explanation)] > > A link to play estimating angles: > http://nrich.maths.org/1235 http://www.mymaths.co.uk/samples/angler.swf
 * Starter
 * Main1
 * Main2[|Examples of drawing,measuring and estimating angles]
 * Plenary

Fun online game for y=mx+c: http://hotmath.com/hotmath_help/games/kp/kp_hotmath_sound.swf