The document discusses finding the area of triangles using the formula Area = 1/2 * base * height. It provides examples of calculating the area of various triangles by measuring their bases and heights. The last example asks what is the area of the Bermuda Triangle, which has a base of 30km and height of 20km.

1. Finding the Area of a
Triangle

2. 10 cm
5 cm
(base)
(height)
A= b x h
A= 10cm x 5cm
A= 50 cm2

3. How many triangles do you
see?

4. How about this, how many triangles
do you see?

6. “The Mayon Volcano situated at
Daraga,Albay is said to have the perfect
cone or triangular shape. Its base ranges
about 13km and its height of about 8km.
What is the area of the Volcano?”

7. Area of a triangle
5 cm
8 cm
A= b x h / 2
A= 5 cm x 8 cm /2
A= 40 cm2 /2
A= 20 cm2
A= bxh
2
b- base & h- height

9. 20 cm
A= b x h / 2
A= 20 cm x 10 cm / 2
A= 200 cm2 / 2
A= 100 cm2
10 cm

10. 10 cm
15 cm
A= b x h / 2
A= 10 cm x 15 cm / 2
A= 150 cm2 / 2
A= 75 cm2

11. Try them yourself!
Find the area of the following triangles:
A = 105 cm2
A = 114 cm2

13. The mysterious Bermuda Triangle or
also known as the Devil's Triangle or
Hurricane Alley, is a loosely defined
region in the western part of the North
Atlantic Ocean. It has a base of 30km
and height of 20km. What is its area?
“The Bermuda Triangle”

15. GROUP 1
ILLUSTRATING THE TRIANGLES
Using your rulers, you are going
to draw a triangle based on the
given measurement.

16. GROUP 2
FINDING THE AREA OF THE
TRIANGLES
You are going to find the area of the
given triangles. You need to show your
solutions.

17. GROUP 3
COMPLETING THE TABLE
You are going to fill in the missing table
based on the given information.

20. *How were you able to find
the area of the triangle?
*What is the formula of
finding the area of the
triangle?

22. A. Find the area of the following triangles.
1. 2.
3. 4.
5.
8cm
7 m
12 cm
10 m
3
cm
5
cm
8
m
11
cm
8
cm 7cm

23. B. Complete the table below.
Base Height Area
2 m2
11m 6m
4cm 16 cm2
2cm 10 cm2

24. Assignment:
Instructions: Find the area of the following and
show your solutions.
1. A swimming pool in the shape of a triangle
has a base of 10m and a height of 8m. Find
the area of the pool?
2. What is the area of a triangle with base 11 m
and height 23 m?