Q: What is the radius of the semi circle in a track?

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It is the same as the radius of the whole circle.

The radius of a semi-circle is the same as the radius of the circle that was cut in half. The radius of a circle is the distance from the center of the circle to any point on the circle. That's the same as 1/2 of the diameter. It's easy to measure it on a semi-circle, because you don't even need to determine where the center is. The diameter is just the length of the flat side, and the radius is half of that.

Just the one and it is its radius when at right angles to the semi-circle's centre

32

find the circumferance as if it was a whole circle but when you get the answer divide it by 2

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It is the same as the radius of the whole circle.

It is half of a circle; the circle's radius (and that of the semicircle) is 10 cm.

The radius of a semi-circle is the same as the radius of the circle that was cut in half. The radius of a circle is the distance from the center of the circle to any point on the circle. That's the same as 1/2 of the diameter. It's easy to measure it on a semi-circle, because you don't even need to determine where the center is. The diameter is just the length of the flat side, and the radius is half of that.

about its radius

The radius is 5.00 cm.

Just the one and it is its radius when at right angles to the semi-circle's centre

32

It's half of the area of the whole circle...

Well the circumference equation is 2pi r and a semi-circle is half of a full circle so the circumference is 15.71 inches.

find the circumferance as if it was a whole circle but when you get the answer divide it by 2

count the number of sides?

Area of the semi-circle = pi*19.12/2 = 573.042 square m to 3 decimal places