area of triangles return to table of contents. area of a triangle let's use the same process as...

Area of Triangles Return to table of contents

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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 ft2 tiles fit across the

bottom of the triangle?

Area of a Triangle

If we continue to build the triangle with rows of 10 ft2,

what happens?

How tall is the triangle? How can you tell?

10 ft

Page 4: 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

How does this help us find the area of the triangle?

Find the area of the rectangle, then divide by 2

20 ft2

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

Page 5: 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

Is this true for all triangles?Let's see!

Calculating base(height) results in 2 triangles!

Page 6: 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

The Area (A) of a triangle is found by using the formula:

Note: The base & height always form a right angle!

Page 7: 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

Example.

Find the area of the figure.

4 cm

10 cm 10 cm

6 cmclick to reveal

Page 8: 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

Try These.

Find the area of the figures.

13 ft

11 ft

9 ft 12 ft 1420

click to reveal click to

reveal

Page 9: 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

73 Find the area.

8 in

5 in

11 in 10 in

Page 10: 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

74 Find the area

15 m

8 m9 m 12 m

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