Lesson 09: Formula for the Area of a Triangle | Unit 1: Area and Surface Area

Multiple Select

Select **all** drawings in which a corresponding height $$h$$ for a given base $$b$$ is correctly identified.

• A

• B

• C

• E

• D

Multiple Choice

What is the area of triangle A if the base b is 3 units and the height h is 4 units?

• 8 square units
• 12 square units
• 10 square units
• 6 square units

Multiple Choice

Here is a right triangle. What is a corresponding height for the base Side $$d$$ ?

• height = d * area
• height = d / 2
• height = (2 * area) / d

Multiple Choice

Here is a right triangle. Which side is a corresponding height for the base Side $$e$$ ?

• f
• d
• g

Multiple Choice

Here is a right triangle. What is a corresponding height for the base Side $$f$$ ?

• height = Area / f
• height = (2 * Area) / f
• height = f / 2

Draw

Identify a base and a corresponding height that can be used to find the area of this triangle. Label the base $$b$$ and the corresponding height $$h$$ . A triangle on a grid that has two vertices 11 units apart from one another horizontally. The third vertex is 2 units below the horizontal side, 5 units to the right of the left vertex, and 6 units to the left of the right vertex.

Open Ended

Find the area of the triangle. Show your reasoning.

Draw

Draw an example of a right triangle with an area of 6 square units on the grid.

Draw

Draw an example of an acute triangle with an area of 6 square units on the grid.

Draw

Draw an example of an obtuse triangle with an area of 6 square units on the grid.