Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Computing Perimeter of Triangle |
Grade: 2-a Lesson: S1-L8 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
If an isosceles triangle has sides 6 cm and 8 cm (8 common), then what is the perimeter of the triangle ? |
|
2 |
Definition: |
An isosceles triangle has two equal sides. The two opposite sides are equal. |
|
3 |
Formula |
The perimeter of an isosceles triangle is |
P = 2a + b |
4 |
Step |
The opposite sides of a triangle are equal so |
8 cm is common one |
5 |
Step |
The other side of a triangle is |
6 cm |
6 |
Step |
The perimeter of an isosceles triangle is |
P = 2a + b |
7 |
Step |
Simplification |
P = 2 (8 + 5) |
8 |
Step |
Simplification |
P = 2 x 13 |
9 |
Step |
Simplification |
P = 26 |
10 |
Step |
The answer is |
26 |
11 |
Step |
Then the perimeter of an isosceles triangle is 26 cm. |
|
12 |
Answer |
C |
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