8. The diameter of a circle is 40 m. Find the area of the circle in terms of pi.

Step-by-step explanation:

To find the area of the circle use the formula pi r^2, r is the radius, so half the diamiter. D/2 = 20.

Now we use pi r^2 = pi * 400

So answer is A.

Option A 400x m²

Step-by-step explanation:

We know that the diameter of a circle is double of the radius.

So the radius will be 40/2 m = 20 m i.e half of the diameter.

According to the question let the pi be x.

Area of a circle

πr²

= x×20m×20m

= 400x m²

Hence option A is correct.

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step-by-step explanation: