The value of x is equal to 17 in an isosceles triangle.
What is an isosceles trapezoid?
A trapezoid that has non-parallel sides and base angles of the same size is said to be isosceles.
An isosceles trapezoid has a pair of parallel sides.
∴ AB∥CD
Its non-parallel sides are equal.
∴ AD=BC
Diagonals of an isosceles trapezoid are equal.
⇒ AC=BD
7x -21 = 5x + 13
7x - 5x = 21 + 13
2x = 34
x = 17
Therefore, the value of x is equal to 17.
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