Презентация на тему по математике на тему Properties of Triangles

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2. Theme of the lesson: Triangle. Properties
3. Properties of Triangles
4. Any triangle containing a 90o angle is
5. Take 3 identical copies of this triangle
6. Calculating unknown AnglesAngle a = 180 –
7. Draw a triangle of any sizeExtend one
8. Exterior Angles of a TriangleDraw a second
9. Copy and complete the following statements:A triangle
10. Draw this diagramCalculate all the angles in
11. Draw this diagramIdentify 2 pairs of congruent
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Theme of the lesson: Triangle. Properties of Triangles. Types of triangle. Aims of the lesson: - to give the definition of the shape: triangle - to give the types of triangle

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Презентация по математике на тему Properties of Triangles

Properties of TrianglesDuisebayeva P.Altynbekov Sh.

Theme of the lesson: Triangle. Properties of Triangles. Types of triangle.

Any triangle containing a 90o angle is a right-angled triangleAn isosceles or

Take 3 identical copies of this triangle and put them together, so:How

Calculating unknown AnglesAngle a = 180 – (90 + 65)

Draw a triangle of any sizeExtend one of the sidesMeasure angle a

Exterior Angles of a TriangleDraw a second triangle of any sizeExtend all

Copy and complete the following statements:A triangle with all sides equal is

Draw this diagramCalculate all the angles in this star.How many right-angled triangles

Draw this diagramIdentify 2 pairs of congruent isosceles triangles.Identify four pairs of

Слайды презентации

Слайд 2 Theme of the lesson: Triangle. Properties of Triangles.

Theme of the lesson: Triangle. Properties of Triangles. Types of

Types of triangle. Aims of the lesson: - to give the

definition of the shape: triangle - to give the types of triangle

Слайд 3 Properties of Triangles

Слайд 4 Any triangle containing a 90o angle is a

right-angled triangle
An isosceles or a scalene triangle may contain

a right angle.

Right-angled
isosceles triangles.

Right-angled
scalene triangle.

Слайд 5 Take 3 identical copies of this triangle and

Take 3 identical copies of this triangle and put them together,

put them together, so:
How can we use this to

help us?

These are the same angles as in the triangle!

The angle sum of a triangle = 1800

Слайд 6 Calculating unknown Angles
Angle a = 180 – (90

+ 65)
= 180

– 155 = 25o

Since the triangle is equilateral,
angles a, b and c are all 60o (180/3)

Слайд 7 Draw a triangle of any size

Extend one of

Draw a triangle of any sizeExtend one of the sidesMeasure angle

the sides

Measure angle a and b
accurately using a

protractor

Add angles a and b together

Measure angle c accurately
using a protractor

What do you notice?

Exterior Angle of a Triangle

Слайд 8
Exterior Angles of a Triangle
Draw a second triangle

Exterior Angles of a TriangleDraw a second triangle of any sizeExtend

of any size

Extend all of the sides

Measure angle a,

b and c
accurately using a protractor

Add angles a, b and c together

What do you notice?

Слайд 9 Copy and complete the following statements:
A triangle with

Copy and complete the following statements:A triangle with all sides equal

all sides equal is called ...
A triangle with two

sides equal is called ...
A triangle with no sides equal is called ...

A triangle with all angles equal is called ...
A triangle with two (base) angles equal is called ...
A triangle with one angle of 90° is called ...

An equilateral triangle has got all equal ... and ...
An isosceles triangle has got two equal ... and ...
Two triangles that are identical in shape and size are called ...