Question

3. How many 1 cm equilateral triangles are there in a 5 cm equilateral triangle?​

Answer 1

Step-by-step explanation:

The side of equilateral triangle is 5 cm and other side of equilateral triangle is 1 cm

Then area of equilateral triangle side 5 cm=

4

3

a

2

=

4

3

×(5)

2

=

4

3

×25cm

2

And area of small equilateral triangle side 5 cm=

4

3

a

2

=

4

3

×(1)

2

=

4

3

×1cm

2

So number of small equilateral triangle cut in big equilateral triangle =

4

3

×1

4

3