As shown in the figure of rectangle , triangle STR is an isosceles triangle.
What is triangle?
" Triangle is defined as the two dimensional closed figure with three vertices , three sides and three angles enclosed in it."
What is isosceles triangle?
" In a triangle when two sides of a triangle are cogruent to each other."
According to the question,
Given,
Rectangle PQRS , with diagonal PR and QS
As per the property of rectangle, diagonals of rectangle are congruent and bisect each other.
Therefore,
\(PR = QS\\\\\implies \frac{PR}{2} = \frac{QS}{2} \\\\\implies TR = TS\)
Therefore,
In triangle STR,
ST≅ TR
As per definition of an isosceles triangle we conclude,
Triangle STR is an isosceles triangle.
Hence, Option (C) is the correct answer.
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