Question

计算以下图形的周长。
476)
25 cm
18 cm
18 cm
477)
14 cm
10 cm
10 cm
478)
12 cm
12 cm
479)
10 cm
10 cm
10 cm

Explanation:

Step1: Sum triangle side lengths

$18 + 18 + 25 = 61$

Step2: Sum triangle side lengths

$10 + 10 + 14 = 34$

Step3: Calculate square perimeter

$4 \times 12 = 48$

Step4: Sum equilateral triangle sides

$10 + 10 + 10 = 30$

Answer:

1. 61 cm
2. 34 cm
3. 48 cm
4. 30 cm