Flashcards › Formulas and Definitions In Math

What is the formula for the area of a triangle? (base x height) divided by 2 What is the formula for the circumfrence of a circle? 3.14 x diameter What is the radius? half the diameter Define: net the pattern of a three dimensional figure laid out flat What is the formula for the area of a circle? 3.14 x radius squared or 3.14 radius to the 2nd power What is the formula for the area of a trapezoid? height � 2 ( base1 + base2) What is the formula for the area of a parallelogram? base x height Define: surface area is the sum of the areas of all the surfaces of a figure How do you find the surface area of a polyhedron? You add the area of each face of the polyhedron Define: polyhedron It is a three dimensional figure whose surfaces, or faces, are all polygons What is the formula for finding the surface area of a cylinder? 2 x 3.14 x radius squared + 2 x radius x 3.14 x height What is the formula for finding the surface area of a sphere? 4 x 3.14 x radius squared What is the formula for finding the surface area of a prism? add all the areas of the faces together to get your answer What is the formula for finding the surface area of a pyramid? add all the areas of the faces together to get your answer What is a cone: a polyhedron or not a polyhedron not a polyhedron What is a triangular prism: a polyhedron or not a polyhedron a polyhedron True or False: All prisms and pyramids are polyhedrons. True True or False: A cone is a polyhedron. False What is the formula for finding the volume of a prism? area of one base x height What is the formula for finding the volume of a cylinder? 3.14 x radius squared x height What is the formula for finding the volume of a cone? one third x 3.14x radius squared x height What is the formula for finding the volume of a pyramid? one third x area of one base x height What is the formula for finding the volume of a sphere? four thirds x 3.14 x radius cubed Formulas for calculating (surface) area, volume, and circumfrence of 2 and 3 dimensional objects Definitions for some math terms