Transcript Shapes And Angles - Kendriya Vidyalaya

Shapes And Angles
What cute
little angles!
What’s so right about
these?
They just look like square
corners to me!
360 degrees
4 right angles
4 lots of 90 degrees
2 lots of 180 degrees
How many ways do I have
to say it?
Everyone
knows this
is
180
degrees!
Using a Protractor
Measuring, calculating and drawing
angles...
learning objectives
To use a protractor to:
a) measure acute and obtuse angles
to the nearest degree.
b) draw acute and obtuse angles to
the nearest degree.
To calculate angles on a straight line.
What do we use to help us
while measuring angles?
A protractor
Here is a standard protractor
When we use a protractor, we
need to line it up correctly.
You need to make sure the protractor is lined up correctly.
Is this ready to measure the angle?
Were you right?......................it wasn’t
Look for the upside down ‘T’ in the middle of
the straight line on your protractor.
This needs to be exactly on the vertex of
your angle.
We need to remember.....
It doesn’t
matter which
way round the
angle is, you
ALWAYS need
to line the upside
down ‘T’ to the vertex
of the angle.
Now you are ready.
Read from the 0°, and follow the inner set of
numbers.
What does it measure?
This angle measures 35°.
Challenge!
Investigating Right Angles
Sort the quadrilaterals into a table like this.
0 right angles
1 right angle
2 right angles
3 right angles
B
A
C
H
G
4 right angles