The value of x in the triangle is 117.2 units
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An equation is formed when two expression is equated by an equal sign to a constant , variable or an expression.
Cosine rule of Triangles is used and is given by
c² = a² + b² - 2ab cos C
Where a, b, c are the sides and C is the angle opposite side c.
from the given data in the figure
c = 63
a = 61 and
angle B is 142 degree
x² = 63² + 61² - 2(63)(61) * cos(142)
On solving
x = 117.2
The value of x in the triangle is 117.2 units
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