Area of a figure

### 1.1. Knowledge to remember

- The rectangle is completely inside the circle. We say: The area of the rectangle is less than the area of the circle.
- Figure consists of 5 equal squares. Figure also includes 5 such squares.

We say: Area of the figure equal to the area of the figure .

We say: Area of the figure is equal to the total area of the figure and picture .

### 1.2. Solving Textbook Exercises

**Lesson 1:** Which sentence is correct and which is wrong?

a) The area of triangle ABC is greater than the area of quadrilateral ABCD

b) The area of triangle ABC is less than the area of quadrilateral ABCD

c) The area of triangle ABC is equal to the area of quadrilateral ABCD

__Solution guide:__

- Using knowledge: If A is completely inside B, the area of A is smaller than the area of B.

The triangle ABC is completely inside the quadrilateral ABCD, so the area of triangle ABC is smaller than the area of quadrilateral ABCD.

a) Wrong

b) Right

c) Wrong.

**Lesson 2:**

a) Figure how many squares?

Figure how many squares?

b) Compare the area of the figure with the figure area

__Solution guide:__

- Count the number of squares of the two shapes and compare.

a) Figure consists of 11 squares, shaped Includes 10 squares

b) Area of the figure larger than the area of the figure

**Lesson 3:** Compare the area of the figure with the figure area

__Solution guide:__

- Match the triangles into unit squares.
- Count the number of squares in each picture and compare.

Figure area equal to the area of the figure (both shapes have an area of 9 squares)

Note: The picture can be cropped into two triangles and put them together to get so the area of the two shapes is equal.

.

=====

## Leave a Reply