Lesson Example Discussion Quiz: Class Homework |
Step-1 |
Title: Area of circle |
Grade: 7-a Lesson: S1-L2 |
Explanation: |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
The radius of a circle is 5cm. Find the area. |
|
2 |
Formula: |
Area of a circle. |
A = \$pi r^2\$ |
3 |
Step |
substitute the 5 for r. |
A =\$22/7\$ \$5^2\$ |
4 |
Step |
Mutliplying. |
A = \$\frac{22}{7}\$ (5)(5) A = \$\frac{22\times(5)(5)}{7}\$ A = \$\frac{22\times25}{7}\$ |
5 |
Step |
Dividing. |
A = \$\frac{550}{7}\$ A = \$\cancel(550)^78.57/\cancel(7)^1\$ A = 78.57 |
6 |
Answer |
The area is \$78.57 cm^2\$. |
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