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The image contains two geometry problems. Here is a breakdown of each question and their solutions.

### Problem 2
**Instructions:** Find the perimeter of the given shapes.

#### Part (a)
Given:
- \( AC = 24 \, \text{cm} \)
- \( OB = 9 \, \text{cm} \)

The shape appears to be a semicircle on top of a triangle.

1. **Find the Radius of the Semicircle:**
   - Since \( OB \) is the radius of the semicircle, \( r = 9 \, \text{cm} \).

2. **Find the Circumference of the Semicircle:**
   - The circumference of a full circle with radius \( r \) is \( 2 \pi r \).
   - For a semicircle, we take half of this: 
     \[
     \text{Semicircle Circumference} = \pi \times r = \pi \times 9 = 9 \pi \, \text{cm}
     \]

3. **Calculate the Perimeter of the Triangle Portion:**
   - The triangle has a base \( AC = 24 \, \text{cm} \), so we

Tentukan keliling bangun datar berikut jika: a. Panjang AC = 24 cm dan OB = 9 cm b. Panjang sisi segiempat beraturan tersebut adalah 5 cm, berapakah keliling lingkaran yang memuat segiempat di bawah ini?

Learn how to calculate the perimeter of a semicircle with a triangle and a circle enclosing a square. This problem involves key concepts such as circumference of a circle and the perimeter of basic shapes. Suitable for students in Grades 9-12.

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