Question

a triangular park has (5,4)(0,0) and (5,0) vertics

Answer 1

Then what to do....
Btw
Area=1/2|5+0+20|
Area=12.5m^2

Answer 2

Plot on graph paper to understand that the base of triangle is at x axis with length 5 cm and height 4 cm. Hence area = 1/2(5 x 4) = 10 sq cm