"The Area of ​​a Triangle" Calculation of the Area of ​​a Polygon PPT Courseware 2

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"The Area of ​​a Triangle" Calculation of the Area of ​​a Polygon PPT Courseware 2

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(1) What is the formula for calculating the area of ​​a triangle? How is it derived?

Triangle area formula: S＝ah÷2

(2) Can anyone tell me what are the similarities and differences between the area formula of a triangle and the area formula of a parallelogram? Why is there a "÷2" in the formula?

(3) A triangle and a parallelogram have the same base and height. The base of the parallelogram is 3 meters and the height is 2 meters. The area of ​​a triangle is ( ) square meters, and the area of ​​a parallelogram is ( ) square meters.

Fill it out

Two identical triangles can be combined into one ( ). The base of this parallelogram is equal to ( ) and the height of this parallelogram is equal to ( ). The area of ​​each triangle is equal to the area of ​​the parallelogram ( ). Because the area of ​​the parallelogram is equal to ( ), the area of ​​the triangle is equal to ( ).

The area of ​​a triangle is 96 square decimeters. The base of this triangle is 16 decimeters. What is the corresponding height of this base? \

h=2S÷a

=2×96÷16

=192÷16

=12 (decimeter)

Answer: The corresponding height of this base is 12 decimeters.

The area of ​​the triangle: S＝ah÷2

According to the formula for calculating the area of ​​a triangle, it can be deduced:

Height of triangle: h=2S÷a

The base of the triangle: a=2S÷h

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For more information about the PPT courseware "Calculating the Area of ​​a Polygon and the Area of ​​a Triangle", please click the Calculation of the Area of ​​a Polygon ppt and the Area of ​​a Triangle ppt tag.

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Update Time: 2024-11-20

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 1 industry PPT template

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