An angle measuring `180^(@)` is called

Options

A. a complete angle
B. a reflex angle
C. a straight angle
D. none of these

Answer

To solve the question "An angle measuring 180 degrees is called," we can follow these steps:

### Step 1: Understand the types of angles
We need to know the different types of angles based on their measurements.

### Step 2: Identify the angle categories
- **Acute Angle**: An angle that measures less than 90 degrees.
- **Right Angle**: An angle that measures exactly 90 degrees.
- **Obtuse Angle**: An angle that measures more than 90 degrees but less than 180 degrees.
- **Straight Angle**: An angle that measures exactly 180 degrees.
- **Reflex Angle**: An angle that measures more than 180 degrees but less than 360 degrees.
- **Complete Angle**: An angle that measures exactly 360 degrees.

### Step 3: Determine the angle in question
The question specifically asks for an angle that measures 180 degrees.

### Step 4: Match the measurement with the angle type
From our understanding of angle types, we can see that an angle measuring 180 degrees is classified as a **Straight Angle**.

### Step 5: Select the correct option
Based on our analysis, the correct answer to the question is **Straight Angle**.

### Final Answer:
An angle measuring 180 degrees is called a **Straight Angle**.

---