Semicircles & Quadrants

Perimeter & Area Math Mastery

Interactive Practice

Master Semicircles & Quadrants

Test your knowledge on finding the area and boundary perimeter of semicircles, quadrants, and composite figures with dynamic visual shapes and instant solutions!

Formula Cheat Sheet & Rules

Semicircle (½ Circle)
  • Area: ½ × π × r²
  • Curved Arc: ½ × π × d or π × r
  • Total Perimeter: Curved Arc + Diameter (½πd + d)
Quadrant (¼ Circle)
  • Area: ¼ × π × r²
  • Curved Arc: ¼ × 2 × π × r = ½ × π × r
  • Total Perimeter: Curved Arc + 2 Radii (Arc + 2r)
Pro Tip: Pay close attention to whether a question asks for Area or Perimeter, and always remember to add the straight boundaries (radii or diameter) for perimeter calculations unless specified otherwise!