Question

Find the area of a triangle whose vertices are given as (1,-1) (-4,6) and (-3,-5)

Answer 1

$1 \div 2 |1(6 + 5) - 4( - 5 + 1) - 3( - 1 - 6)| \\ 1 \div 2 |1 \times 11 + ( - 4 \times - 4) +( - 3 \times - 7) | \\ 1 \div 2 |11 + 16 + 21| \\ 1 \div 2 |48 | \\ 48 \div 2 = 24$