Verified Answer :

frika

The area of triangle is

\(A_{triangle}=\dfrac{1}{2}\cdot \text{base}\cdot \text{height}.\)

From the diagram it is seen that

\(\text{ base }=r,\\\text{ height }=x.\)

Then

\(A_{triangle}=\dfrac{1}{2}\cdot r\cdot x.\)

Answer: correct choice is D.

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