Hi, i urgently need help with this subject, i need to complete it for a course i am wanting to enrol in, but maths wasn't for me, now i am stuck. i need help with this question,

Find the area of the triangle with the lengths 2.87 m, 3.69 m and 4.58 m

565 mm, 823 mm and 1.08 m

i have no idea how to do this,

can someone please help me.