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Area of Circles and Semicircles

The area of a circle is pi times radius squared. Radius is half of the diameter. pi is approximately 3.14, or precisely 22/7. A semicircle is half of a circle, so the area of a semicircle is the area of a circle divided by 2. This Steps Math channel explains the most important math concepts you'll encounter in 6th, 7th, and 8th grade math class, which you'll need to master before you graduate on to high school math. Middle school math is the foundation for everything that comes next in high school. Without a strong grasp of middle school math topics, high school algebra, geometry, trigonometry, and even college-level math become confusing and flat-out impossible. Learn these middle school math concepts now. Here's what I cover in my channel; here are the main middle school math concepts you need to know: 1) Fractions, Decimals & Percents Operations with fractions, converting between forms, and solving real-world percent problems — these appear EVERYWHERE in high school! 2) Ratios, Rates & Proportions Understanding relationships between quantities, solving proportions, and working with unit rates. This is the gateway to linear equations and algebra. 3) Integers & Rational Numbers Adding, subtracting, multiplying, and dividing positive & negative numbers — crucial for algebra and almost every high school math topic. 4) Expressions & Equations Writing, simplifying, and solving one- and two-step equations (plus intro to inequalities). This is literally the start of algebra! 5) Geometry Basics Area, perimeter, volume, surface area, angles, Pythagorean Theorem basics, and transformations — these concepts explode in high school geometry. 6) Proportional Relationships & Linear Functions Graphing lines, finding slope, and understanding y = mx + b. This is the bridge to advanced functions and graphing in high school. 7) Exponents, Roots & Scientific Notation Working with powers, square/cube roots, and very large/small numbers — essential for physics, chemistry, and higher math. 8) Data, Statistics & Probability Mean, median, mode, box plots, basic probability — these skills carry over into high school stats and real-world decision making. Why is middle school math crucial? Because high school math (Algebra 1, Geometry, Algebra 2, Pre-Calculus, and Calculus) builds directly on middle school math ideas. If you skip or are unclear on these concepts now, advanced math will be impossible. Master middle school math early, and you'll open doors to STEM jobs, higher test scores on the SAT, ACT, or HSPT tests, and confidence in your future math classes. Whether you're a student trying to get ahead, a parent helping your middle schooler, or just someone who wants to finally understand math, this channel is for you. Thank you for watching and reading this description. You're welcome to leave a comment on any confusing topic or problem, and I'll try to make a video on it. #MiddleSchoolMath #MathHelp #LearnMath #PreAlgebra #Algebra #AlgebraBasics #Fractions #MathForKids #MathTips