Sniper Mode: Surface Measurement

1. Triangles

• Hero's Formula: Area = √(s(s-a)(s-b)(s-c)), where s = (a+b+c)/2.
• Equilateral: Area = (√3/4)a². Height = (√3/2)a.
• Right Angle: 1/2 * Base * Height.

2. Quadrilaterals

• Rectangle: Area = L x B. Peri = 2(L+B). Diag = √(L²+B²).
• Square: Area = a² or d²/2. Peri = 4a.
• Parallelogram: Base x Height.
• Rhombus: 1/2 x d1 x d2. (All sides equal, diagonals bisect at 90).
• Trapezium: 1/2 x (Sum of parallel sides) x Height.

3. Circle

• Area: πr². (Pi = 22/7).
• Circumference: 2πr.
• Semi-Circle: Area = πr²/2. Peri = πr + 2r (Don't forget diameter!).

4. Sniper Tricks

• Path outside: Area = (L + B + 2w) * 2w.
• Path inside: Area = (L + B - 2w) * 2w.
• Path cross: Area = (L + B - w) * w.