Formulas

• Formula for the area of a sector?

  (θ/360) x pi x r²
• Formula for the area of a segment?

  area of sector - area of triangle
• Formula for the length of an arc

  (Angle/360) x 2 x pi x r
• Formula for the area of a circle?

  pi x r²
• Formula for the circumference of a circle?

  pi x Diameter OR 2 x pi x r²
• Formula for the area of a trapezium?

  1/2(a + b)h
• Formula for the volume of a prism?

  area of cross section x length
• Formula for the cross section?

  base x height (sometimes divide by 2)
• Formula for compound interest?

  initial amount x (100% - percentage given)^years given
• Formula for simple interest?

  Find the percentage of the initial amount x years given