2 years ago

How many total circles will be used if there are 20 rows of circles? Show all calculations.

Mathematics

1 answer:

Rashid [163]2 years ago

3 0

Answer:

210

Step-by-step explanation:

As there is one circle in first row, 2 circles in 2nd row and three in third row, which clearly implies that the number of circles in each row is equal to the row number. So, we have to calculate sum of first 20 numbers to calculate the total number of circles.

n=20

Total Circles=(n(n+1))/2

=(20 (20+1))/2

=(20(21))/2

= 420/2

=210

So the total number of circles will be 210.

You might be interested in

Consider the transformations of a rectangle ABCD to produce a rectangle DEFG. Which sequence of Transformations results in recta

liraira [26]

Answer:

Step-by-step explanation:

Rotations preserve shape <u>and</u> size, but a dilation with a factor of 3, no matter where in the sequence of transformations it is, results in a shape 3 times larger. So rotation followed by the dilation will end up being a rectangle similar to the original but 3 times its size.

5 0

2 years ago

Rose rolled a regular 6-sided dice. What is the probability she rolled an even number?

kherson [118]

Answer:

$\frac{3}{6}$