joanne smithies our lady & st. gerards rcp the distance around the outside of a shape is called...
TRANSCRIPT
Joanne Smithies Our Lady & St. Gerards RCP
The distance The distance around the around the outside of a outside of a
shape is called shape is called the perimeter.the perimeter.
8 cm8 cm
6 cm6 cm
8 cm8 cm
6 cm6 cm
The perimeter of the shape is 8 + 6 + 8 The perimeter of the shape is 8 + 6 + 8 + 6 = 28cm.+ 6 = 28cm.
First we need to find the length of each side by First we need to find the length of each side by counting the squarescounting the squares..
What is the What is the perimeter perimeter of each of of each of
these these shapes? shapes?
18cm18cm18cm18cm
18cm18cm22cm22cm
26cm26cm
Now find the Now find the perimeter of perimeter of
these shapes. these shapes. They are not They are not
drawn to drawn to scale.scale.
3cm3cm
3cm3cm
3cm3cm
3cm3cm
3cm3cm
3cm3cm
5cm5cm
7cm7cm7cm7cm
3cm3cm
4cm4cm 4cm4cm
4cm4cm 4cm4cm
3cm3cm 3cm3cm
3cm3cm3cm3cm
Perimeter = 18cmPerimeter = 18cm Perimeter = 22cmPerimeter = 22cm Perimeter = 28cmPerimeter = 28cm
77ccmm
5cm5cm
5cm5cm
33ccmm
33ccmm
33ccmm
3cm3cm 3cm3cm
3cm3cm
To order Fractions
Learning Objective
Use a protractor to draw and measure acute and obtuse
angles to the nearest degree.
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What are the properties of a protractor??
A protractor
Here is a standard protractor like you use in the classroom.
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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?
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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.
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We need to remember.....
It doesn’t matter which way round the angle is, you ALWAYS need to line the upsidedown ‘T’ to the vertexof the angle.
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Now you are ready.
Read from the 0°, and follow the inner set of numbers.
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Once you reach 30° you need to be careful!!!
You then need to look at the 1° markings on the outer set of numbers.
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What does it measure?
This angle measures 35°.
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What does it measure?
This angle measures......
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What does it measure?
This angle measures......
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Mr Obtuse Angle
This is Obtuse. He’s the husband of the family. He’s bigger than Right and Acute . He’s always inside, and he always measures between 90° and 180° (depending on how much dinner he’s eaten!)
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Mrs. Right Angle
This is me. I’m Mrs. Right Angle. I always measure 90°, my favourite shape is a square, and whats more, no matter what my husband tells you, I’m always right!
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Baby Acute AngleThis is baby Acute angle. Isn’t he cute?! He loves a hug, and always has his arms out for cuddles! He’s the smallest of the family, measuring less than 90°.
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Reflex AngleThis is our pet dog, Reflex. He’s always outside. He’s only a pup at the moment so he measures 180°, but he can grow up to 360 °! So he’s definitely the biggest angle. You’ll never see him without that ball in his mouth either, horrid thing!
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So, now you’ve met us, let’s see how well you
know us...Who am I?
I’m the smallest angle
I always measure less than 90°
I’m very cute!
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I’m....
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Who am I?
I’m the biggest angle
I’m always outside
I can measure between 180° and 360°
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I’m...
Reflex Angle
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Who am I?
I’m always inside
I always measure between 90° and 180 °
I’m bigger than Right and Acute
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I’m...
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Who’s left?
YOUR TASK!
1. Draw an angle2. Estimate it’s size in
degrees3. Measure4. Write what type of
angle it is
To order Fractions, Decimals and Percentages.
Learning Objective
Measure and calculate angles at a
point.
HOW MANY RIGHT ANGLES IN A CIRCLE?
90°
HOW MANY DEGREES IN A CIRCLE?
HOW MANY DEGREES IN A STRAIGHT LINE?
WHAT ARE THESE ANGLES?
A120 °
CALCULATE THE MISSING REFLEX
ANGLE
47°
313°
CALCULATE THE MISSING STRAIGHT
LINE ANGLE
69° 111°
CALCULATE THE MISSING REFLEX
ANGLE
126°
234°
CALCULATE THE MISSING STRAIGHT
LINE ANGLE
42°
103°35°
Learning Objective
Calculate angles in a triangle.
PROPERTY OF TRIANGLES
The sum of all the angles equals 180º degrees. 60º
60º60º+
180º60º 60º60º
WHAT IS THE MISSING ANGLE?
70º70º
?+180º70º 70º
?
WHAT IS THE MISSING ANGLE?
90º30º
?+180º30º 90º
?
WHAT IS THE MISSING ANGLE?
60º60º
?+180º60º 60º
?
WHAT IS THE MISSING ANGLE?
30º78º
?+180º
78º 30º
?
WHAT IS THE MISSING ANGLE?
40º40º
?+180º
40º 40º
?
Equilateral Triangle
All 3 Sides are equal in Length
All 3 interior angles are the same
Isosceles Triangle
Two Sides of equal Length
Two interior angles are the same
Scalene Triangle
No Sides of equal Length
All interior angles are different
Right-Angled Triangles
They have an Interior angle of 90 degrees
Right-Angled Triangles can be either Isosceles or scalene triangles
Scalene Right Angled Triangle Isosceles Right Angled Triangle
Learning Objective
Calculate angles in a triangle.
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
L.O angles quiz
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reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
L.O angles quiz
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
?
reflex right
acute obtuse
WHAT IS THE MISSING ANGLE?
60º 60º
?
WHAT IS THE MISSING ANGLE?
25º 95º
?
WHAT IS THE MISSING ANGLE?
65º 65º?
WHAT IS THE MISSING ANGLE?
74º 40º
?
WHAT IS THE MISSING ANGLE?
40º 40º
?