Area of Triangles Return to table of contents. Area of a Triangle Let's use the same process as we did for the rectangle & parallelogram. How many 1 ft.

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Presentation transcript:

Area of Triangles Return to table of contents

Area of a Triangle Let's use the same process as we did for the rectangle & parallelogram. How many 1 ft 2 tiles fit across the bottom of the triangle?

Area of a Triangle If we continue to build the triangle with rows of 10 ft 2, what happens? How tall is the triangle? How can you tell? 10 ft

How does this help us find the area of the triangle? Find the area of the rectangle, then divide by 2 20 ft 2 See that the rectangle we built is twice as large as the triangle. How do you find the area of a triangle? 10 ft 4 ft

Is this true for all triangles? Let's see! Calculating base(height) results in 2 triangles!

The Area (A) of a triangle is found by using the formula: Note: The base & height always form a right angle!

Example. Find the area of the figure. 4 cm 10 cm 6 cm click to reveal

Try These. Find the area of the figures. 13 ft 11 ft 9 ft12 ft click to reveal

73Find the area. 8 in 5 in 11 in 10 in

74 Find the area 15 m 8 m 9 m 12 m