📚 Topic Summary
The area of a circle is the amount of space inside the circle. To find it, you use a special number called pi (π), which is about 3.14, and the radius (r) of the circle, which is the distance from the center to any point on the edge. The formula to calculate the area (A) is $A = \pi r^2$. This means you square the radius (multiply it by itself) and then multiply that by pi. This worksheet helps you practice using this formula!
🧮 Part A: Vocabulary
Match each term with its definition:
- Term: Radius
- Term: Diameter
- Term: Pi (π)
- Term: Area
- Term: Circumference
Definitions (Mix and Match):
- The distance around the circle.
- The distance from the center of the circle to any point on its edge.
- The amount of space inside the circle.
- The distance across the circle through the center.
- A constant approximately equal to 3.14159.
✍️ Part B: Fill in the Blanks
Complete the following paragraph using the words provided:
To find the ______ of a circle, you need to know the ______. The formula is A = πr², where π (pi) is approximately 3.14. First, you ______ the radius, and then you multiply the result by ______. So, if a circle has a radius of 5 cm, its area is approximately ______ cm².
Word Bank: area, radius, square, pi, 78.5
🤔 Part C: Critical Thinking
Imagine you have two pizzas: one with a 10-inch diameter and another with two 7-inch diameters. Which option gives you more pizza and why?