Free isosceles triangle calculator — find height, angles, area, perimeter, circumradius, and inradius from any two known values. Step-by-step working shown. Covers apex angle, base angles, isosceles right triangle, and equilateral special cases
Free absolute value calculator — solve |ax+b|=c equations and |ax+b|
Free hemisphere calculator: find volume V=(2/3)πr³, curved surface area 2πr², total surface area 3πr², and sphere circumference C=2πr from any known value. Step-by-step working for all hemisphere and sphere formulas
Free pyramid volume calculator for square, rectangular, triangular and hexagonal pyramids. Find volume, surface area, slant height and lateral edge with step-by-step working. V = (1/3)Ah for all pyramid types
Free truncated cone calculator — find volume, surface area, lateral area, and slant height of any frustum. Step-by-step working with cone subtraction verification. Handles all special cases including full cone and cylinder limits
Free cone calculator — find volume, surface area, lateral area, slant height, and height of a cone from any two known dimensions. Step-by-step working for every calculation. Solve for height, radius, or slant height from volume or area inputs
Free trapezoid area calculator — find area, perimeter, and height of standard, isosceles, right, and irregular trapezoids using coordinates or side lengths. Full step-by-step working. Also called trapezium calculator (UK)
Free trig identities calculator — verify and prove trigonometric identities step by step, solve trig equations, and browse the complete reference of Pythagorean, double angle, half angle, sum-to-product, and product-to-sum formulas
Free quotient rule calculator — find d/dx[f/g] = (f’g−fg’)/g² with full step-by-step working. Derives tan(x), sec(x), csc(x), cot(x) from first principles. Includes 8 practice problems and quotient+chain rule combinations
Free product rule calculator — find d/dx[u·v] = u’v + uv’ with full step-by-step working. Handles triple products, product+chain rule combinations, and partial derivative product rule. Includes 8 worked practice problems