"Area of ​​Parallelogram" Area of ​​Polygon PPT Courseware 3

Description

"Area of ​​Parallelogram" Area of ​​Polygon PPT Courseware 3

teaching objectives

1. Experience the process of exploring the formula for the area of ​​a parallelogram through hands-on operations, discussion, and induction.

2. Explore and master the area formula of parallelograms, and be able to use the formula to calculate the area of ​​parallelograms.

3. In the process of exploring the area formula of a parallelogram, feel the mathematical thought of transformation; feel the orderliness of the derivation process of the area formula and the certainty of the mathematical conclusion.

Review and consolidate

What geometric shapes have you learned?

Area of ​​rectangle = length × width

Area of ​​a square = side length × side length

Explore new knowledge

If S represents the area of ​​the parallelogram, a represents the base of the parallelogram, and h represents the height of the parallelogram, then the formula for calculating the area of ​​the parallelogram is:

Area of ​​parallelogram = base × height

S = a × h

S = a·h

S=ah

practice

1. There is a parallelogram steel plate (as shown below). What is its area in square meters? (Keep the result as an integer)

4.8×3.4

=16.8

≈17 (square meters)

Answer: Its area is 17 square meters.

2. Make a movable parallelogram wooden frame yourself.

(1) Measure its base and height and find its area.

(2) Pull it, observe whether the base and height of the parallelogram have changed, measure and calculate its area.

3. It is known that the area of ​​a parallelogram is 56 square meters and the base is 8 meters. How many meters high is it?

56÷8＝7 (meters)

Answer: Its height is 7 meters.

4. There is a parallelogram vegetable plot with a base of 30 meters and a height of 15 meters. If 5 kilograms of spinach are harvested per square meter of vegetable land, how many kilograms of spinach can be harvested from this land?

30×15×5

=450×5

=2250 (kg)

Answer: This land can harvest 2,250 kilograms of spinach.

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Update Time: 2024-11-20

This template belongs to Mathematics courseware Hebei Education Edition Fifth Grade Mathematics Volume 1 industry PPT template

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