3x + 12 find the value of x?
Is it:
16.8
7.8
4
or 3
2007-04-06 20:22:12 · 4 answers · asked by Case 1 in Science & Mathematics ➔ Mathematics
angles 1+2+3=180
thus 7x+3x+12+ angle 3=180
angle 3=180-7x-3x-12
now on solving,
10x=168
thus x=16.8
2007-04-07 00:10:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
the information given is incomplete... so it is hard to compute... but if angle1=angle2 then x=3
16.8 is an impossible answer because the sum of angle1&2 will already be 180 and since a triangle has 3 angles and its sum should be 180, thenif 2 angles already has a sum of 180, then it is not a triangle.
so, possible answers would be the last 3 choices
2007-04-06 21:18:00 · answer #2 · answered by tan_precious 2 · 0⤊ 0⤋
via fact the whole measures of the angles in a triangle is one hundred eighty, then the equation is degree of angle1 + degree of perspective 2 = degree of perspective 3 = one hundred eighty enable x be the degree of perspective a million x + 21 = degree of perspective 2 x - 15 = degree of perspective 3 with the help of substitution x + 21 +x + x - 15 = one hundred eighty 3x + 6 = one hundred eighty 3x = one hundred eighty - 6 3x = 174 x = fifty 8 = degree of 1st perspective fifty 8 + 21 = seventy 9 = degree of 2d perspective fifty 9 - 15 = 40 3 = degree of third perspective to verify: fifty 8 + seventy 9 + 40 3 = one hundred eighty
2016-12-15 18:29:35 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Please provide a diagram or a detailed description of the triangle. With the information provided it is impossible to know what angles 1 and 2 are and therefore impossible to answer the question.
2007-04-06 20:53:56 · answer #4 · answered by Northstar 7 · 0⤊ 0⤋