§2.5 The Area of a Triangle

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

C2 Distance and Area

Mr. Fintelman (FNL)

Monday November 4th

2024

Date	Monday November 4th 2024
Paragraph	§2.5 The Area of a Triangle
Pages from the handbook	Pag. 72-76
Subject	Area of a Triangle

Today is the day...

I can already…

1. … draw medians in a triangle.
2. … draw altitudes in a triangle.

Prior Knowledge

What is a median?

What is an altitude?

After this lesson, I can...

1. … calculate the area of a triangle.
   
2. … calculate the area of an obtuse triangle.

Goals

Area of a Triangle

Area of a Triangle

Area of a Triangle

Make exercise 55 - pag. 73

1. Determine the base and the height of the triangle.
   
2. Calculate the area in mm².

Exercise 55 - pag. 73

Make exercise 59 - pag. 73

1. Determine the base and the height of the triangle.
2. Calculate the area in mm².

Exercise 59 - pag. 73

Area of an obtuse triangle

Exercise

1. Determine the base and the height of the triangle.
2. Calculate the area in mm².

Solution

Area

Area                                                       mm²

△ABC=​2​​1​​⋅AB⋅CD

△ABC=​2​​1​​⋅30⋅16=240

Worktime

• You work neatly by…
  
• … reading the theory (again) before asking a question to your classmate.
  
• … raising a hand before asking a question to the teacher.
  
• … if the teacher is busy, remember your question and move on.

Help:

Exercises: 55, 56, 58, 59, 60 and 62.

Assignments:

Pages: 72-76

Exercises: 55, 56, 58, 59, 60 and 62.

Assignments from the planning of WEEK 1:

Extra:

Exercises: 63, 64 and 65.

Now I can...

1. … calculate the area of a triangle.
2. … calculate the area of an obtuse triangle.

Reflection