Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Perimeter of semicircle |
Grade: 7-a Lesson: S1-L5 |
Explanation: |
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
The radius of a semicircle is 14m.Find the perimeter. |
|
2 |
Formula: |
Perimeter of a semicircle. |
\begin{align} P &= \pi r + d \\ \end{align} |
3 |
Step |
Substitute \$22/7\$ for \$pi\$ and 14 for r. |
\$ P = \frac{22}{7} (14) + 2(14) \$ |
4 |
Step |
Cancel out common factor. |
\$ P = \frac{22}{\cancel7^1} (\cancel{14}^2) + 2(14) \$ |
5 |
Step |
Multiply. |
\$ P &= 44 + 28 \$ |
6 |
Step |
Add. |
\$ P = 72 \$ |
7 |
Answer |
The perimeter is \$72 m\$. |
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