Geometry
# Area of Triangles

What is the area of a triangle with side lengths $9,12,$ and $15?$

What is the area of a triangle with side lengths $13, 14,$ and $15?$

What is the area of a triangle with side lengths $9, 11,$ and $10?$

What is the area of a triangle with side lengths $3,5,$ and $7?$