\]1. A circle has a radius of 7 cm. Calculate its circumference and then find the area of the circle. Use \(\pi \approx 3.14\).

["# How to Calculate the Circumference and Area of a Circle with a Radius of 7 cm", "Understanding the basic properties of circles is essential in mathematics and everyday applications—from architecture to engineering. One of the most fundamental concepts is the circle, defined by its radius and calculated circumference. In this guide, we’ll explore how to find both the circumference and the area of a circle when the radius is 7 cm, using (\pi \approx 3.14).", "---", "## Step 1: Calculate the Circumference of the Circle", "The circumference (C) of a circle is the distance around its edge and is calculated using the formula:\n[ C = 2\pi r ]\nwhere ( r ) is the radius.", "Given ( r = 7 ) cm and ( \pi \approx 3.14 ), substitute these values into the formula:\n[ C = 2 \ imes 3.14 \ imes 7 ]\n[ C \approx 2 \ imes 21.98 ]\n[ C \approx 43.96 \ ext{ cm} ]", "So, the circumference of a circle with a radius of 7 cm is approximately 43.96 cm.", "---", "## Step 2: Calculate the Area of the Circle", "The area (A) of a circle is the space enclosed within its boundary and is calculated with the formula:\n[ A = \pi r^2 ]", "Using the same radius ( r = 7 ) cm and (\pi \approx 3.14):\n[ A = 3.14 \ imes 7^2 ]\n[ A = 3.14 \ imes 49 ]\n[ A \approx 153.86 \ ext{ cm}^2 ]", "Thus, the area of the circle is approximately 153.86 cm².", "---", "## Why This Matters: Real-World Applications", "Knowing how to compute the circumference and area of a circle helps in various practical situations:\n- Designing round structures or objects\n- Estimating material needs in construction\n- Solving geometry and trigonometry problems\n- Understanding measurements in everyday life, such as circular tables, wheels, or plates", "---", "## Final Summary", "For a circle with a radius of 7 cm:\n- Circumference ≈ 43.96 cm\n- Area ≈ 153.86 cm²", "Always remember the core formulas:\n- Circumference: ( C = 2\pi r )\n- Area: ( A = \pi r^2 )", "Using (\pi \approx 3.14) simplifies calculations while maintaining accuracy for most practical purposes.", "---", "Key Takeaways:\n✔ Circumference = (2 \ imes 3.14 \ imes 7 = 43.96 \ ext{ cm})\n✔ Area = (3.14 \ imes 49 = 153.86 \ ext{ cm}^2)\n✔ Simplify circle calculations with (\pi \approx 3.14)\n✔ Understand both circumference and area for geometric applications", "Whether you're a student, teacher, or DIY enthusiast, mastering circle formulas gives you a powerful tool for accurate measurements and design projects."]