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1/2 base x height

What is the formula for the area of a triangle?

2

What is the area of a right triangle 2 cm by 4 cm?

15

What is the area of a right triangle 6 cm by 5 cm?

10

What is the area of a right triangle 5 cm by 4 cm?

12

What is the area of a right triangle 4 cm by 6 cm?