2007-09-15 15:41:37 · 14 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
A=40 b/c a Triangle=180 and B+C=140 so A has to be 40.
2007-09-15 15:47:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
If B= 40 is an angle (and should be, given B is a capital letter)
then , its an easy problem , only you need to do this 180-(40+100)=40.
If B is a side then it has not a solution given the triangle ABC can not to be rectangle .
2007-09-15 15:54:31 · answer #2 · answered by vega 2 · 0⤊ 0⤋
A = 40
because the angles of a triangle should be always equal to 180 degrees so A = 180 - (40 + 100)
A = 180 - 140
A = 40
2007-09-15 15:48:25 · answer #3 · answered by devilishlyangelic91 2 · 0⤊ 0⤋
When you add up the inside angles of a triangle it always equals 180. YOu can try this if you want- take a paper triangle and cut off the points. if you put them all together it will make a straight line.
So, we know there are 180 degrees total. Subtract 100, subtract 40, that equals 40.
2007-09-15 15:46:53 · answer #4 · answered by niffer 3 · 0⤊ 0⤋
The measure of all triangles add up to 180 degrees. To solve this problem, you add 40+100 which equals 140. Then you subtract 180-140 yo get 40.
2016-05-20 22:16:35 · answer #5 · answered by Anonymous · 0⤊ 0⤋
A+B+C=180
A+40+100=180
A=180-100-40
A=40
2007-09-15 16:04:21 · answer #6 · answered by susie 1 · 0⤊ 0⤋
40
2007-09-15 15:45:41 · answer #7 · answered by Anonymous · 0⤊ 0⤋
40 becauce the total degree of a triangle is 180 degrees. 100+40=140+40+180: your answer
2007-09-15 15:53:57 · answer #8 · answered by tonikrissy14 1 · 0⤊ 0⤋
angle a is 40
because all angles in a triangle add up to 180 degrees
2007-09-15 15:53:17 · answer #9 · answered by zacefron 1 · 0⤊ 0⤋
a triangle has a total of 180 degress.
so 100+40=140 180-140= 40
a=40 degrees
2007-09-15 15:47:22 · answer #10 · answered by penguins.are.koo 4 · 0⤊ 0⤋