Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Area of circle |
Grade: 7-a Lesson: S1-L2 |
Explanation: |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
The diameter of a circle is 14m. Find the area. |
|
2 |
Formula: |
Radius of a circle. |
r = \$d/2\$ |
3 |
Step |
Substitute 14 for d. |
r = \$\cancel{14}^2/{2}\$ \$r = 7\$ |
4 |
Step |
Radius. |
r = 7 |
5 |
Formula: |
Area of a circle. |
A = \$pi r^2\$ |
6 |
Step |
Substitute \$22/7\$ for \$pi\$ and 7 for r. |
A = \$\frac(22)(7) (7)^2\$ |
7 |
Step |
Multiply. |
A = \$\frac(22)(7)\times(7)\times(7)\$ A = \$\frac(22)(7)\times(49)\$ A = \$1078/7\$ |
8 |
Step |
Divide. |
A = \$\cancel{1078}^154/\cancel{7}^1\$ A = 154 |
9 |
Answer |
The area is \$154 m^2\$. |
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