A triangular plot of land has two adjacent sides measuring and , forming an included angle of . What is the area of this land?
Answer and explanation
Correct answer: C.
- Step 1: Use the sine formula for triangle area: .
- Step 2: Substitute , , and , noting that : .
Answer
.
Why not the others: forgets the factor of in the area formula; omits entirely, calculating ; mistakenly sets .
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