Question

worksheet 20
find the perimeter of the following figures.

1. perimeter = (side + side + side)

= (16 + 30 + 22) cm
= 68 cm
2)
3)
4)
5)
6)

Explanation:

Step1: Calculate perimeter of figure 2

$$\begin{align*} \text{perimeter}&=(18 + 18+18)\text{ cm}\\ &=54\text{ cm} \end{align*}$$

Step2: Calculate perimeter of figure 3

$$\begin{align*} \text{perimeter}&=(12 + 5+9)\text{ m}\\ &=26\text{ m} \end{align*}$$

Step3: Calculate perimeter of figure 4

$$\begin{align*} \text{perimeter}&=(14 + 14+11)\text{ m}\\ &=39\text{ m} \end{align*}$$

Step4: Calculate perimeter of figure 5

$$\begin{align*} \text{perimeter}&=(11 + 8+13)\text{ cm}\\ &=32\text{ cm} \end{align*}$$

Step5: Calculate perimeter of figure 6

$$\begin{align*} \text{perimeter}&=(21 + 13+25)\text{ cm}\\ &=59\text{ cm} \end{align*}$$

Answer:

1. \(54\text{ cm}\)；3) \(26\text{ m}\)；4) \(39\text{ m}\)；5) \(32\text{ cm}\)；6) \(59\text{ cm}\)