Question

question 1 (1 point)
the diameter of a circle is 15 feet. what is its radius?
○ a 30 feet
○ b 7.5 feet
○ c 15 feet
○ d 3.873 feet

question 2 (1 point)
the radius of a circle whose diameter is 11.5 cm is ______ cm.
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Explanation:

Question 1

Step1: Recall the relationship between diameter and radius.

The radius \( r \) of a circle is half of its diameter \( d \), so the formula is \( r=\frac{d}{2} \).

Step2: Substitute the given diameter.

Given \( d = 15 \) feet, then \( r=\frac{15}{2}=7.5 \) feet.

Step1: Use the diameter - radius relationship.

The formula for radius \( r \) in terms of diameter \( d \) is \( r=\frac{d}{2} \).

Step2: Substitute the given diameter.

Given \( d = 11.5 \) cm, then \( r=\frac{11.5}{2}=5.75 \) cm.

Answer:

b. 7.5 feet

Question 2