Question 188 of 480
On a pie chart, there are four sectors of which three angles are 45°, 90° and 135°. If the smallest sector represents N28.00, how much is the largest sector?
- A. N96.00
- B. N84.00
- C. N48.00
- D. N42.00
Correct Answer:
B
Explanation
To solve the problem of finding the amount represented by the largest sector on a pie chart, we need to follow a series of logical steps. Let's break it down step-by-step.
### Step 1: Understand the Pie Chart
A pie chart represents data in a circular format, where each sector (or slice) corresponds to a proportion of the whole. The total angle in a pie chart is always 360°. In this case, we have three known angles: 45°, 90°, and 135°.
### Step 2: Calculate the Total Angle of the Known Sectors
First, we need to find the total angle of the known sectors:
- 45° + 90° + 135° = 270°
### Step 3: Determine the Angle of the Unknown Sector
Since the total angle in a pie chart is 360°, we can find the angle of the unknown sector by subtracting the total of the known angles from 360°:
- Angle of the unknown sector = 360° - 270° = 90°
### Step 4: Find the Total Value Represented by the Pie Chart
We know that the smallest sector (which is 45°) represents N28.00. To find the total value represented by the pie chart, we need to determine the value per degree.
First, we calculate the value per degree:
- Value per degree = Amount represented by the smallest sector / Angle of the smallest sector
- Value per degree = N28.00 / 45° = N0.6222 (approximately)
### Step 5: Calculate the Value of Each Sector
Now that we have the value per degree, we can calculate the value of each sector:
1. **For the 45° sector:**
- Value = 45° * N0.6222 = N28.00 (as expected)
2. **For the 90° sector:**
- Value = 90° * N0.6222 = N56.00
3. **For the 135° sector:**
- Value = 135° * N0.6222 = N84.00
4. **For the unknown sector (90°):**
- Value = 90° * N0.6222 = N56.00 (as calculated above)
### Step 6: Identify the Largest Sector
From our calculations, we have:
- 45° sector = N28.00
- 90° sector = N56.00
- 135° sector = N84.00
- Unknown sector (90°) = N56.00
The largest sector is the one with the angle of 135°, which corresponds to N84.00.
### Step 7: Evaluate the Options
Now, let's look at the options provided:
- A. N96.00
- B. N84.00
- C. N48.00
- D. N42.00
The correct answer is **B. N84.00**, as it represents the value of the largest sector (135°).
### Why Other Options Are Incorrect
- **A. N96.00**: This value does not correspond to any of the sectors calculated. It is higher than the maximum value we found (N84.00).
- **C. N48.00**: This value does not match any of the sectors. It is also lower than the smallest sector value (N28.00).
- **D. N42.00**: Similar to option C, this value does not correspond to any sector and is lower than the smallest sector value.
### Revision Summary
- A pie chart's total angle is 360°, and the angles of the sectors must sum to this total.
- The value represented by each sector can be calculated using the value per degree derived from the smallest sector.
- The largest sector corresponds to the largest angle, which in this case is 135°.
- The correct answer is B. N84.00, representing the largest sector on the pie chart.