andi did a test. the test had 20 questions. for each correct answer he gains 5 points and if he errs he loses 2 points. andy ans
2 answers:
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Answer:
Step-by-step explanation:
We are asked to find the circumference and area of a circle with a radius of 3 meters.
<h3>1. Circumference </h3>The circumference is the perimeter of a circle. It is calculated using the following formula:
We know the radius of the circle is 3 meters, but we must find the radius. The radius is the line from the center to the circle's edge, while the diameter is the line through the center from edge to edge. Therefore, the diameter is twice the radius.
- d= 2 r
- d= 2 * 3 m
- d= 6 m
The diameter is 6 meters and we are using 3.14 for pi. Substitute these values into the circumference formula.
Multiply.
The area is the size of the circle's surface. It is calculated using the following formula.
The radius is 3 meters are we are using 3.14 for pi. Substitute these values into the area formula.
Solve the exponent.
- (3 m)² = (3 m)(3 m)= 9 m²
The circumference is 18.84 meters and the area is 28.26 square meters.
Answer:
<h2>The radius is 4 units long.</h2>Step-by-step explanation:
The given equation is
This equation belongs to a circle, which center is at (0.5, 3.5) and its radius is 4.
You can deduct its elements, becase this equation of the circle is explicit, which means the constant term represents the square power of the radius. Solving that, we have
Therefore, the radius is 4 units long.