Creating Formulas in ExcelFinding the missing angle of a triangle or rectangle
Step 1Open up Excel
Step 2In cell A1, type the word “triangles” You may change color, font, size when you are done with the whole assignment, not now.
Step 3Skip a cell, in cell A3, type “ angle 1”In cell A4, type “ angle 2”In cell A5, type “ angle 3”
Step 4We know that a triangle has a total of180 degrees.Do not type anything in B3 or B4 yet.In B5, type the formula (exactly):=180-(B3+B4) then press enter(think about what this formula means,you many need to explain it later)
Step 5Let’s say we have a triangle, 1 side ofthe triangle is 40 degrees, another is 30degrees.In B3 type 40, and in B4 type 30.Don’t change anything in B5.What comes up in B5? Is this correct?
Step 6Repeat the process for the rectangles,starting with writing “Rectangles” inD1.This time you will have 4 angles.Decide what formula you will use. (raiseyour hand if you don’t understand)
Step 7Save your excel sheet in math folder as:Missing_Angle_Calculator
Step 8 Answer the following questions (using your excel creation) Find the missing angle:1. Triangle: side 1= 20°, side 2=70°, side 3=?2. Triangle: side 1=30°, side 2=60°, side 3=?3. Triangle: side 1= 73°, side 2= 15°, side 3=? Write your answers down.
Step 8 Answer the following questions (using your excel creation) Find the missing angle:4. Rectangle: side 1= 20°, side 2=70°, side 3=55°, side 4=? Write your5. Rectangle: side 1=39°, side 2=58°, side answers down. 3=100°, side 4=?6. Rectangle: side 1= 73°, side 2= 99°, side 3=111°, side 4=?
Step 9You may customize your excel sheet(change font, color, size, etc)