Question

A semicircular flower bed has a diameter of 3 metres.

What is the area of the flower bed?


Give your answer to 1 decimal place.

Use π = 3.14

Answer 1

3.5
`m^2`

Explanation:

If the shape is half of a circle, you will be using this formula: A =
`(1)/(2)` π
`r^2`

Your radius is half of the diameter. r = d/2 = 3/2 = 1.5

Substitute r = 1.5 into the formula.

A =
`(1)/(2)` π
`1.5^2`

A =
`(1)/(2)` (3.14)
`1.5^2`

Use your calculator to find the answer and round your answer.

3.5

Answer 2

Explanation:

The formula for determining the area of a circle is expressed as

Area = πr²

Where

π is a constant whose value is given as 3.14.

r represents the radius of the circle.

From the information given,

Diameter of the flowerbed is 3 meters.

Radius = diameter/2

Radius of flowerbed = 3/2 = 1.5 meters.

Since the flower bed is semi circular , the area would be divided by 2. Therefore

Area = 1/2 × 3.14 × 1.5²

= 3.5325

Approximately 3.5 m² to 1 decimal place