# List of all Basic Area & Surface area Formulas

 Area of a circle Formulas: $$\pi r^2$$ r= radius Area of a triangle Formulas: $$\sqrt{s(s-a)(s-b)(s-c)}$$ a, b, c is length of sides, s is semi-perimeter Area of a trapezoid Formulas: $$\frac{a+b}{2} \times h$$ a, b is base and h is height Area of a rectangle Formulas: $$l \times w$$ l is length, w is width Area of a square Formulas: $$a^2$$ a is length of side Area of a parallelogram Formulas: $$l \times w$$ l is length, w is width Area of a right triangle Formulas: $$\frac{a \times b}{2}$$ a, b is side of right angle triangle Area of equilateral triangle Formulas: $$\frac{\sqrt{3}}{4} \times a^2$$ a is length of side Area of isosceles triangle Formulas: $$\frac{b \times h}{2}$$ b is base, h is height of triangle Area of a hexagon Formulas: $$\frac{3 \sqrt{3}}{2} \times a^2$$ a is length of side Area of a sector Formulas: $$\frac{\theta}{360} \pi r^2$$ r= radius Area of a rhombus Formulas: $$\frac{p \times q}{2}$$ p, q diagonal of rhombus Area of an oval Formulas: $$\pi \frac{a}{2} \times \frac{b}{2}$$ a is major axis, b is minor axis Area of a ring Formulas: $$\pi (R^2 – r^2)$$ R is Outer radius, r is inner radius Area of an octagon Formulas: $$2 (1+ \sqrt{2}) a^2$$ a is length of side Area of a semicircle Formulas: $$\pi \frac{r^2}{2}$$ r= radius Area of a pentagon Formulas: $$\frac{1}{4} \sqrt{5(5+2 \sqrt{5} )} a^2$$ a is length of side Area of a kite Formulas: $$\frac{p \times q}{2}$$ p, q diagonal Area of an ellipse Formulas: $$\pi \frac{a}{2} \times \frac{b}{2}$$ a is major axis, b is minor axis Surface Area of a sphere Formulas: $$4 \pi r^2$$ r is radius Surface Area of a cylinder Formulas: $$2 \pi r (r+h)$$ r is radius, h height Surface Area of a cube Formulas: $$6 a^2$$ a is length of side Surface Area of a cone Formulas: $$\pi r (r + \sqrt{h^2 + r^2})$$ r is radius, h height Surface Area of a box Formulas: $$2(h × W) + 2(h × L) + 2(W × L)$$ width (w), length (l) and height (h) Surface Area of a rectangular prism Formulas: $$2(wl+lh+hw)$$ width (w), length (l) and height (h) Surface Area of a triangular prism Formulas: $$ab+3bh$$ width (a), length (b) and height (h) Surface Area of a pentagonal prism Formulas: $$5ab+5bh$$ width (a), length (b) and height (h) Surface Area of a Hexagonal prism Formulas: $$6ab+6bh$$ width (a), length (b) and height (h) Surface Area of a Square Pyramid Formulas: $$2(b × s) + b^2$$ Slant Hiehgt (S), base (b) Surface Area of a Triangular Pyramid Formulas: $$\frac{1}{2}(a × b) + \frac{3}{2}(b × s)$$ Altitude (a), Slant Hiehgt (S), base (b) Surface Area of a Pentagon Pyramid Formulas: $$\frac{5}{2}(a × b) + \frac{5}{2}(b × s)$$ Altitude (a), Slant Hiehgt (S), base (b) Surface Area of a Hexagonal Pyramid Formulas: $$3(a × b) + 3(b × s)$$ Altitude (a), Slant Hiehgt (S), base (b)