What is the areas of this?

Area is a measure of the two-dimensional space enclosed by the boundaries of an object. There are various ways of calculating area.
For a rectangle simply multiply each dimension:
Area = Length * Width.For a circle:
Area = π * r2,Where π is the constant pi (approximately 3.14159) and r is the radius of the circle.
For a triangle:
Area = 0.5 * Base * Altitude,Where Altitude is measured perpendicular to the Base.