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4. Discuss with your friends your findings.
(a) Compare the results of the area obtained in Steps 1, 2 and 3. What can
you conclude?
(b) What is the general formula to calculate the area of a triangle?

5. State all the conclusions that can be made.

From the results of Exploration Activity 2, it is found that

b

a a a

the area of a triangle with the length of base a and height b
is calculated by Base and height
are always at a
1
area of triangle = ab right angle.
2
1
In general, the area of a triangle = × length of base × height
2

3 Group

Aim : To derive the formula for the area of parallelograms.
Instruction: Perform the activity in groups of four.

D C D F c C E CHAPTER

b b 10

A a B A a B

Diagram (a) Diagram (b)
1. Diagram (a) shows a rectangle ABCD with length of base a and height b.
Referring to Diagram (a), state the area of ABCD in terms of a and b.

2. Diagram (b) shows a parallelogram ABEF with the length of base a and height b.
Referring to Diagram (b),
(a) state the length of CE in terms of a and c based on the properties
of parallelogram.
(b) state the length of DF in terms of a and c.
(c) explain your findings.

233
Perimeter and Area

10 TB Math F1.indd 233 11/10/16 12:19 PM