In a triangle, the greater side is opposite to the greater angle.
Triangle property:
In a triangle, the greater angle has the longer side opposite to it.
For example:
Let's consider △ABC
Let's assume ∠BAC>∠BCA
⇒BC>BA,
Hence, the given statement is true.
In a triangle, the length of the side opposite to the larger angle will be greater than the length of side opposite to smaller angle.
In a triangle other than an equilateral triangle, angle opposite the longest side is greater than