Subjects geometry

Trapezium Angles 79F09D

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1. **State the problem:** We have a trapezium symmetric about line AB. The angles given are \( (x + 33)^\circ \) at the top-left, \( (k + 33)^\circ \) at the top-right, and \( (5x - 24)^\circ \) at the bottom-left. We need to find the values of \(x\) and \(y\) (assuming \(y = k\) since \(k\) is mentioned). 2. **Use symmetry:** Since AB is the line of symmetry, the top-left and top-right angles are equal, so: $$ x + 33 = k + 33 $$ which simplifies to $$ x = k $$ 3. **Use trapezium angle properties:** The trapezium has two pairs of adjacent angles on the same side of a leg that are supplementary (sum to 180°). Since AB is the axis of symmetry, the bottom-right angle equals the bottom-left angle reflected, so bottom-right angle is also \( (5x - 24)^\circ \). 4. **Sum of angles on one leg:** The top-left and bottom-left angles are on the same leg, so: $$ (x + 33) + (5x - 24) = 180 $$ Simplify: $$ 6x + 9 = 180 $$ $$ 6x = 171 $$ $$ x = \frac{171}{6} = 28.5 $$ 5. **Find \(k\):** Since \(x = k\), $$ k = 28.5 $$ 6. **Find \(y\):** The problem states to find \(y\), but only \(k\) is given. Assuming \(y = k\), then $$ y = 28.5 $$ **Final answers:** $$ x = 28.5, \quad y = 28.5 $$