Algebra (बीजगणित)
Quadratic Formula (द्विघात सूत्र):
x = [-b ± sqrt(b² – 4ac)] / 2a
Trigonometry (त्रिकोणमिति)
sin²θ + cos²θ = 1
tanθ = sinθ / cosθ
sin(90° – θ) = cosθ
Mensuration (क्षेत्रमिति)
Area of Circle (वृत्त का क्षेत्रफल): πr²
Volume of Cylinder (बेलन का आयतन): πr²h
Volume of Cone (शंकु का आयतन): (1/3)πr²h
Surface Area of Sphere (गोले का पृष्ठीय क्षेत्रफल): 4πr²
Electricity (विद्युत)
Ohm’s Law (ओम का नियम): V = IR
Power (शक्ति): P = VI = I²R = V²/R
Resistance in Series (श्रेणी में प्रतिरोध): R = R1 + R2 + …
Resistance in Parallel (समांतर में प्रतिरोध): 1/R = 1/R1 + 1/R2 + …
Light – Optics (प्रकाश)
Mirror Formula (दर्पण सूत्र): 1/f = 1/v + 1/u
Lens Formula (लेंस सूत्र): 1/f = 1/v – 1/u
Magnification (आवर्धन): m = -v/u (Mirror), m = v/u (Lens)
Refractive Index (अपवर्तनांक): n = c / v
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