okay the point at the top is B - (right angle) than bottom left (looking at it) is A and bottom right is C
B-A is 6cm
B-C is 8cm
A-C is 10cm

Question is find the area of the triangles using the perpendicular height formula

another Question is find the area of the triangle ABC - Now to find the area of a triangle isnt it A=1/2 X BASE X PERPENDICULAR HEIGHT?