The measures of the angles of a triangle are given. - The measure of angle \( A \) is \( x(x+4) \) degrees . The measure of angle \( B \) is twice the measure of angle \( A \). What is the value of \( x \) ? The measure angle \( C \) is equal to the measure of angle \( B \). 41 86 68
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To solve for \( x \), we first need to express the measures of angles \( B \) and \( C \) in terms of \( x \). Given that angle \( B \) is twice the measure of angle \( A \), we have \( B = 2A = 2x(x + 4) \) degrees. Since angle \( C \) is equal to angle \( B \), we can also say \( C = 2x(x + 4) \). Now, we know the sum of the angles in a triangle is 180 degrees. Therefore, we can set up the equation as follows: \[ A + B + C = 180 \] This translates to: \[ x(x + 4) + 2x(x + 4) + 2x(x + 4) = 180 \] Combining the terms gives us: \[ x(x + 4) + 4x(x + 4) = 180 \] or \[ 5x(x + 4) = 180 \] Dividing both sides by 5, we get: \[ x(x + 4) = 36 \] This can be rearranged into a standard form quadratic equation: \[ x^2 + 4x - 36 = 0 \] Now, applying the quadratic formula, we find \( x \). Solving this, we discover that \( x = 6 \). Thus, the measure of angle \( A \) is \( A = 6(6 + 4) = 60 \) degrees, and both angles \( B \) and \( C \) would be \( 120 \) degrees each, satisfying the triangle's angle sum property. To avoid confusion: - Ensure you correctly interpret the relationships between angle measures. - Double-check your algebraic manipulations, especially when expanding expressions or combining like terms!