The problem asks to solve for $x$ given the expressions for the measures of the angles in a quadrilateral inscribed in a circle, where two angles are $3x+11$ and $6x-7$ and another one is $35$. Because the quadrilateral is inscribed in a circle, the sum of opposite angles equals 180 degrees.

GeometryCyclic QuadrilateralAnglesAlgebraSolving Equations
2025/5/13

1. Problem Description

The problem asks to solve for xx given the expressions for the measures of the angles in a quadrilateral inscribed in a circle, where two angles are 3x+113x+11 and 6x76x-7 and another one is 3535. Because the quadrilateral is inscribed in a circle, the sum of opposite angles equals 180 degrees.

2. Solution Steps

Let the four angles of the quadrilateral be A,B,C,A, B, C, and DD. We are given that A=3x+11A = 3x+11, B=6x7B = 6x-7, and C=35C = 35. Since the sum of angles in a quadrilateral is 360 degrees, A+B+C+D=360A+B+C+D = 360. Also, opposite angles of a cyclic quadrilateral are supplementary, i.e., add up to 180 degrees.
We have two cases:
Case 1: AA and CC are opposite angles. Then A+C=180A+C = 180, so 3x+11+35=1803x+11+35 = 180, i.e., 3x+46=1803x+46=180.
Case 2: BB and CC are opposite angles. Then B+C=180B+C = 180, so 6x7+35=1806x-7+35 = 180, i.e., 6x+28=1806x+28 = 180.
In Case 1, 3x+46=1803x+46 = 180.
3x=18046=1343x = 180 - 46 = 134.
x=1343x = \frac{134}{3}.
In Case 2, 6x+28=1806x+28 = 180.
6x=18028=1526x = 180 - 28 = 152.
x=1526=763x = \frac{152}{6} = \frac{76}{3}.
Since the problem has right angle symbols where they meet at the center of the circle, this implies that the angles 3x+113x+11 and 6x76x-7 are opposite angles. Thus,
3x+11+6x7=1803x+11 + 6x-7 = 180.
9x+4=1809x + 4 = 180.
9x=1769x = 176.
x=1769x = \frac{176}{9}.

3. Final Answer

176/9

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