ALGEBRA 1
posted by DANIELLE .
FOUR OF THE ANGLES OF A PENTAGON HAVE THE MEASURE 30,70, 120, AND 165. TO FIND THE MEASURE OF THE FIFTH I ADD THE FOUR MEASURES WHICH IS 385 AND SUBTRACT IT FROM 540 WHICH IS
540385=135 WOULD THIS BE CORRECT.
IS THERE A FOMULA THAT I NEED TO USE TO ARRIVE AT MY ANSWER ? Thanks
That's almost correct. You have the right idea except 540  385 does not equal 135. Subtract that again and you'll get it.
You are also right that sum of the angles in a pentagon is 540. To figure that out, take the amount of sides the shape has and multiply that by 180. Then subtract 360 from that.
So the pentagon has 5 sides. 5*180 = 900. Subtract 360 and you have 540.
If it had 100 sides, the sum of all the angles would be
100*180 = 18000.
18000360 = 17640
Now, good luck drawing the 100 sided figure :)
Matt
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