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Place variety of
angles on board; estimate as:
Less than 90° (acute)
90° (right)
90° - 180° (exclusive)
(obtuse)
180° - 360° (exclusive)
(reflex);
add names if known.(include different line lengths:
see Plenary) |
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Use angle measurer;
distinguish between and estimate the size of acute,
obtuse & reflex angles |
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angle
degree (°)
circle
acute
obtuse
reflex
right angle
estimate
measure |
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Give correct labels
for angles in Starter if not known.
Using a selection of drawn angles, discuss
- what is an angle?
- -how to estimate angle
s- 2 very different angles can be recognised by
eye;
- 2 very similar angles need to be measured;
- how to measure angles |
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Activity
Suggestions:
Using a selection of angles:
a) name b) estimate c) measure |
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'What is an Angle?
( common misconception - where 2 lines meet )
Turnabout Activity:Ask class to stand; give series
of instructions, such as right turn 90° ...
left turn 180° ... left turn 270°.. |
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Turnabout
activity repeated, describing movements of
different pupils
OR
Find 6 examples of parallel & perpendicular
lines in the classroom |
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- Identify
parallel & perpendicular lines; know the sum
of angles at a point, on a straight line & in
a triangle
- & recognise vertically opposite angles |
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parallel
perpendicular
angles on a straight line
angles at a point
triangle
circle
vertically opposite angles |
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Relate 1/2 turns,
quarter turns, etc to angles of a 360² circle;
extend to angles at a point & angles in a straight
line.
Show that angles in a triangle add up to 180°
by tearing 3 corners off any paper triangle and
forming a straight line |
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1) Find missing
angles in a series of diagrams, using rules concerning:
- the sum of angles at a point
- angles on a straight line
- angles in a triangle
2) Extend to diagrams including vertically opposite
angles
3) Extension:
Angles
on a Straight Line Using Algebra |
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Use a diagram containing
at least 2 parallel lines; find missing angles.
Use to recap 3 rules& to highlight meaning of
'parallel' |
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1st quadrant on
board / OHP
Identify co-ordinates on a grid in 1st quadrant |
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| - Use conventions
& notation for 2-d co-ordinates in all 4 quadrants;
find co-ordinates of points determined by geometric
information |
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axis, axes
coordinates
direction
origin
position
quadrant
x-axis
y-axis
x-coordinate
y-coordinate |
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All 4 quadrant on
board / OHP
Identify co-ordinates in all 4 quadrants |
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1) Activities involving
reading co-ordinates from a plotted shape
2) Activities involving plotting a shape from an
ordered list of co-ordinates
3) Games, eg: Battleships |
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Review notations
for co-ordinates:Which comes 1st, x or y co-ordinate?
Difference between(2, 3), (-2, -3), (-2, 3), (2,
-3)? |
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