Lesson Example Discussion Quiz: Class Homework |
Step-1 |
Title: Circumference of a circle |
Grade: 7-a Lesson: S1-L3 |
Explanation: |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
The radius of a circle is 6 cm. Find the diameter. |
|
2 |
Formula: |
Circumference of a circle. |
C = \$2 \pi r\$ |
3 |
Step |
Substitute \$22/7\$ for \$pi\$ and 7 for r. |
c = \$2\times\frac(22)(7) \timesr\$ |
4 |
Step |
Cancel out common factor. |
C = \$2\times22/\cancel{7}^1\times\cancel{7}^1\$ C = \$2\times(22)\$ |
5 |
Step |
Multiply. |
C = \$2\times(22)\$ c = 44 |
6 |
Answer |
The circumference is \$44cm\$. |
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