10.5 Problem Solving Skills: Circle Graphs Date ___________________

Circle Graph: Compares data that are parts of a whole Uses percents to divide the circle into sectors

Make a circle graph of the following data: Housing typeNumber Single-family home9070 Two-family home3023 Three-to-six family home756 Seven or more units buildings2267

Steps: 1) Add all of the data to find the total 2) Find what percent each number is of the total by dividing part by whole and multiplying by 100 3) Find the central angles that correspond to each percent by multiplying percent by 360 4) Estimate the angles in the circle graph for each type of data

Total: Housing typeNumberPercent Single-family home9070 Two-family home3023 Three-to-six family home 756 Seven or more units buildings = 15,116 Steps 1 and 2: 9070/15,116 = % 3023/15,116 = % 756/15,116 = % 2267/15,116 = %

Housing typePercentCentral Angle Single-family home 60% Two-family home20% Three-to-six family home 5% Seven or more units buildings 15% Steps 3: 0.6(360) = 216 o 0.2(360) = 72 o 0.05(360) = 18 o 0.15(360) = 54 o

Steps 4: Single-family home Two-family home Three-to-six family home Seven or more units buildings