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Площадь треугольника 8 класс PowerPoint PPT Presentation


Площадь треугольника 8 класс

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Площадь треугольника 8 класс

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, .


.

S1

S2

H

F

F = H S1 = S2


,

.

S2

S3

S1

S4

S = S1 + S2 + S3 + S4


.

a

a


a

b-

b

a


a

h -

h

a


a

h -

h

a


, .

.


1

2

5

12

7

S=49

S=60


3

4

10

h

4

S=60

11

S=44

h=6


5

h

6

18

30

S=180

h=10


6

14

h

8,1

h=7

S=56,7


7

3

4

8

12


7

3

24

9

8

36

4


8

3

9

3

3

4

80

8

3

6

2

10


9

5

10

5

10


, .


B

a

h -

h

a

A

C


B

D

:

h

a

A

C


a

b

-

c

b

a


10

11

6

4

11

8

S=24

S=22


12

13

4

4

3

10

S=20

S=6


, .

5

10

5

10


3

4

8

5

4

6


14

, 8 10 .

A

D


d1, d2


h

a

a

a

h -

b

a,b -

d1, d2


, .

.


, .

A


1

2

1 S= 16

1 S= 35

2 S= 60

2 S= 44

3 S= 21

3 S= 20


, .

A


  • :

  • .52 ;

  • 468(,), 471, 476;

  • .



, .

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