how to find the value of x,and m<BCA?

0 ⤊

how to find the value of x,and m<BCA?

http://i66.photobucket.com/albums/h267/irvingtons_girl_power/MATH8.jpg

2007-01-01 05:19:05 · 2 answers · asked by bottle of rum 1 in Science & Mathematics ➔ Mathematics

2 answers

Remember, the sum of the degree measures of the angles in a triangle is 180 degrees. Therefore:

3x + 4x + 5x = 12x = 180.

x = 180/12 = 15 degrees.

Measure of angle BCA is 3(15) = 45 degrees.

The other angles then are 4(15) = 60 degrees and 5(15) = 75 degrees. Adding these all together, we get:

45 + 60 + 75 = 180.

So, apparently, our analysis is correct.

2007-01-01 05:28:35 · answer #1 · answered by MathBioMajor 7 · 0⤊ 0⤋

3x+4x+5x = 180
Solve for x, x = 15
mâ BCA = 3x = 3(15) = 45 degree

2007-01-01 13:29:30 · answer #2 · answered by sahsjing 7 · 0⤊ 0⤋