3-1 F-angles and Z-angles (p. 78)

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

F-angles and Z-angles

(p. 78)

What you need:

- Textbook, writingbook, iPad

- Pen, pencil, geotriangle

- Calculator

Schoolbags in the cuboard

Phones in the phonebag

Bluetooth 

- ON

- VPN off

Lesson goal

Calculate unknown angles 

using F-angles and Z-angles

F-angles

When two sides are parallel

and it is intersected by a third line

you get equal angles

In geometry you must always write a reason!!

Z-angles

When two sides are parallel

and it is intersected by a third line

you get equal angles

2a A1 and B1

1. Z-angles
2. F-angles
3. Opposite angles
4. Isosceles

2a A3 and B1

1. Z-angles
2. F-angles
3. Opposite angles
4. Isosceles

2b

1. Z-angles
2. F-angles
3. Opposites angles
4. F-angles and opposite angles

2c

1. A4; B4; B2
2. A4; B1; B2
3. A4; B4; B3
4. A1; B4; B2

2d

1. there are no Z shapes
2. There are no F shapes
3. There are no parallel sides
4. The lines are skew

3a) Sleep het juiste antwoord naar het juiste doel.

72

108

3b

3c

3d A2=

3d B1=

Trapezium

A quadrilateral that has two parallel sides is called a trapezium.

What shape is KLMN?

1. Parallelogram
2. Trapezium
3. Rhombus
4. Rectangle

What shape is this?

1. Parallelogram
2. Trapezium
3. Rhombus
4. Rectangle

What shape is DEFG?

1. Parallelogram
2. Trapezium
3. Rhombus
4. Rectangle

Try on your own

1, 2, 5 and 7

TRY ON YOUR OWN...

RULES:

• In your writingbook
• Use: Textbook
• Discussion when you are stuck is allowed

Extra excercise: B1 and B2 (p. 94)

Challenge: C1 (p. 98)

7, 4, 5, 6

(p. 79)