Question

I need help on this question please and explanation

Answer 1

Answer:

453.73 $km^{2}$ (the last option, in red)

Step-by-step explanation:

The formula for finding the area of a semi circle is half the formula for finding the area of a whole circle ( since semi is half a circle). The formula is:

$\frac{\pi r^{2} }{2}$ where r is the radius.

Since the diameter is given, we have to first find the radius of the circle.

Radius = half of diameter = $\frac{diamter}{2}$

Radius = $\frac{34}{2}$ = 17km

Now we can find the area of the semi circle.

The value of pi is taken as 3.14

$\frac{3.14 . 17^{2} }{2}$  (The dot between the 3.14 and $17^{2}$ shows that you have to multiply both of them)

= $\frac{3.14 . 289}{2}$

= $\frac{907.46}{2}$

Area of the semi circle = 453.73 $km^{2}$

Answer 2

Answer:

RED 453.73km

Step-by-step explanation:

So what I'm going to do is find the area of it as if it was a full circle then cut it in half.

So the formula to find the area of a circle is A = $\pi r^{2}$

So to find r (radius) cut the diameter in half. 34/2 = 17

Plug in

A = $\pi 17^{2}$

A = 907.46

Now cut it in half

453.73km would be the answer

HOPE THIS HELPS YA!!!