Evaluate the exact triangular area \(21\sqrt{3}/2~\text{square}~\text{units}\) to the nearest tenth, preserving the correct units.

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Report only 21√3/2 square units and omit the decimal interpretation.

Round to the nearest whole unit and report 18 square units instead of the stated nearest-tenth interpretation.

Evaluate 21√3/2 as 18.2 units and report a linear length instead of an area.

21√3/2 square units≈18.2 square units to the nearest tenth.

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Curriculum context

Course: Math III
Standard: G-SRT.9
Category: Geometry
Domain: Similarity, Right Triangles, and Trigonometry
Objective: Derive the triangle area formula A=1/2ab sin(C) using an auxiliary altitude.
Problem type: Evaluate and interpret triangle area to stated precision