
Answer:
D). an equilateral triangle inscribed in a circle
Step-by-step explanation:
Oliver draws a line on a paper and from a point on the line draws a circle. He then measures the radius of the circle and constructs an arc on the circle from the point on the circumference where the radius meets. This gives a chord because on joining the point where the arc coincides on the circumference and the point where the radius meets the circumference gives you a chord which is equal to the radius of the circle.
Then join the arc from the center of the circle which gives us a equilateral triangle of equal sides which is equal to the radius of the triangle.
Hence, option D is correct.