Ratios
A=1/2 B*h
Or Multiply the base and height and then divide by 2.
Anna earns $12 in 3 hours. How much does she make in 5 hours?
What is $20
What is the area of a rectangle with a base of 10cm and a height of 5 cm?
A=50cm2
What is the area of a triangle with a base of 10m and a height of 7m?

A=35m2