Class 4 Exam > Class 4 Questions > If the radius of a circle is 2.5 cm, its diam...
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If the radius of a circle is 2.5 cm, its diameter is ———–
- a)5 cm
- b)4 cm
- c)7.5 cm
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
If the radius of a circle is 2.5 cm, its diameter is ———–a)5 cmb)4 cmc...
To find the diameter of a circle, you simply multiply the radius by 2. In this case, 2.5 cm * 2 = 5 cm.
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If the radius of a circle is 2.5 cm, its diameter is ———–a)5 cmb)4 cmc...
Explanation:
To understand why the correct answer is option A, let's first define the terms radius and diameter of a circle.
Radius: The radius of a circle is the distance from the center of the circle to any point on its circumference. It is denoted by the letter "r".
Diameter: The diameter of a circle is the distance across the circle passing through its center. It is twice the length of the radius. The diameter is denoted by the letter "d".
Now, let's solve the problem step by step.
Given: The radius of the circle is 2.5 cm.
Step 1: Calculating the diameter using the formula for diameter.
The formula for finding the diameter of a circle is:
d = 2 * r
Substituting the given value of the radius into the formula:
d = 2 * 2.5 cm
d = 5 cm
Therefore, the diameter of the circle is 5 cm.
Conclusion:
The correct answer is option A, which states that the diameter of the circle is 5 cm.
To understand why the correct answer is option A, let's first define the terms radius and diameter of a circle.
Radius: The radius of a circle is the distance from the center of the circle to any point on its circumference. It is denoted by the letter "r".
Diameter: The diameter of a circle is the distance across the circle passing through its center. It is twice the length of the radius. The diameter is denoted by the letter "d".
Now, let's solve the problem step by step.
Given: The radius of the circle is 2.5 cm.
Step 1: Calculating the diameter using the formula for diameter.
The formula for finding the diameter of a circle is:
d = 2 * r
Substituting the given value of the radius into the formula:
d = 2 * 2.5 cm
d = 5 cm
Therefore, the diameter of the circle is 5 cm.
Conclusion:
The correct answer is option A, which states that the diameter of the circle is 5 cm.
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If the radius of a circle is 2.5 cm, its diameter is ———–a)5 cmb)4 cmc)7.5 cmd)none of theseCorrect answer is option 'A'. Can you explain this answer?
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