The area of the triangle with vertices $(3,8)$, $(-4,2)$ and $(5,1)$ is:
A15.25 sq units
B30.5 sq units
C25 sq units
D61 sq units
Answer & Solution
Correct answer: B. 30.5 sq units
Area = ½|3(2−1) + (−4)(1−8) + 5(8−2)| = ½|3 + 28 + 30| = ½·61 = 30.5 sq units.
Related questions
Determinants take each square matrix to exactly how many values?The adjoint of a matrix is assembled out of its:Which of these is worked out first, before the cofactor?The signed minor of an element is written using which letter:The determinant of a matrix may be a number that is:A matrix that is not square has a determinant that is:Determinants can solve systems in two or three:Systems of linear equations can be solved using the inverse of a: