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1st F ch13 ANGLES
CH4 Similarity
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Slide 1:
Slide
Wiskunde
Middelbare school
havo, vwo
Leerjaar 2
This lesson contains
11 slides
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text slides
.
Lesson duration is:
50 min
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CH4 Similarity
Slide 1 - Slide
Types of angles
Acute angle: between 0° and 90°
Right angle: 90°
Obtuse angle: between 90° and 180°
Straight angle: 180°
Full angle: 360° (A full angle is also called a full turn)
Slide 2 - Slide
Both a straight angle and a full turn look like a straight line. The arc is used to show it is an angle.
Slide 3 - Slide
Opposite angles
Opposite angles
are the angles on opposite sides of the point of intersection of two lines. Opposite angles are always equal.
Slide 4 - Slide
Calculating angles
Calculate the size of all angles.
Slide 5 - Slide
Calculating angles
Calculate the size of all angles.
Slide 6 - Slide
Sum of the angles
The sum of the three angles in a triangle is 180°
The sum of the four angles in a quadrilateral is 360°
∠
A
+
∠
B
+
∠
C
=
1
8
0
°
∠
D
+
∠
E
+
∠
F
+
∠
G
=
3
6
0
°
Slide 7 - Slide
Calculating angles
Calculate the size of angle C.
Slide 8 - Slide
Calculating angles
Calculate the size of angle C.
∠
C
=
1
8
0
−
8
2
−
6
0
=
3
8
°
Slide 9 - Slide
Special triangles
In an
equilateral
triangle, all sides are the same length and all angles are 60 degrees.
In an
isosceles
triangle, two sides are the same length and two angles are the same size.
Slide 10 - Slide
Homework Monday
- Make and correct: R1, R3, R4, R5, R6
- Bring your calculator (every lesson!)
Slide 11 - Slide
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