4. \( \frac{1}{2} \times 3.14 \times 7 \times 14 \)

Did you know that the formula you're using here is actually for calculating the area of a circle? Specifically, when you think about \( \frac{1}{2} \times \pi \times r^2 \) where \( r \) is the radius. If you view this as the area of a semicircle, you're effectively finding half of the circle’s area with radius 14 cm. It perfectly illustrates how geometry can be simplified into a single equation! Now, when applying this knowledge, remember to always check your arithmetic! A common mistake when dealing with fractions and large numbers is getting tangled up in multiplying and simplifying. Break it down step by step: calculate \( 14 \times 7 \) first, then multiply that by \( 3.14 \), and finally divide by \( 2 \) to avoid any slip-ups. Happy calculating!