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2 years ago

10

Explain why you can use πr2 to find the area of the base of a cone

1 answer:

olga nikolaevna [1]2 years ago

8 0

The base of a cone is a circle.

The area of a circle is $\pi r^2$ .

Thus, the area of the base of a cone $\pi r^2$ .

The derivation of the formula for the area of a circle involves a bit of calculus, but if you'd like, I can walk you through it.

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Please help me I need this ASAP (5.6) times 1/8

Triss [41]

Answer:

7/10 or 0.7

Step-by-step explanation:

The first step that you need to do is to convert 5.6 to a fraction. 5.6 can be rewritten as $\frac{56}{10}$ , which is equal to $\frac{28}{5}$ .To multiply two fractions together, you simply need to multiply together the numerators and then the denominators. $\frac{28}{5}\cdot\frac{1}{8}=\frac{28}{40}=\frac{7}{10}=0.7$ . Hope this helps!

3 0

2 years ago

In a small chess tournament, 20 matches were played. Find out how many people were involved if it is known that each participant

Nina [5.8K]

Answer:

<em>5</em><em> players participated in the tournament.</em>

Step-by-step explanation:

In a small chess tournament, 20 matches were played.

Let us assume that n number of players participated in the tournament

As in each game 2 players play, so the number of ways they can play is,

$=\ ^nC_2$

As they played 2 games with every other participant in the tournament.

So the total number of games is,

$=\ 2\times ^nC_2$

But it is given to be 20, so

$\Rightarrow \ 2\times ^nC_2=20$

$\Rightarrow \ ^nC_2=10$

$\Rightarrow \dfrac{n!}{2!(n-2)!}=10$

$\Rightarrow \dfrac{n(n-1)}{2}=10$

$\Rightarrow {n(n-1)=20$

As $5\times 4=20$ , so we get n=5.

Therefore, 5 players participated in the tournament.

5 0

2 years ago

Read 2 more answers

14 What value of x makes this equation true?<br> 12x - 15 = 6 - 3x<br><br> Plsss help me and hurry

rodikova [14]

Answer:

1.4

Step-by-step explanation:

12x+3x=15+6

15x=21

X=21/15

X=7/5 or 1.4

5 0

2 years ago

A convex polygon has Choose...<br> sides when the interior angle sum is 1980º.

Viefleur [7K]

Answer:

13 sides.

Step-by-step explanation:

(n - 2) = 1980 / 180 = 11.

n = 13

When the sum of the interior angles is 1980 degrees, the convex polygon will have 13 sides.

i hope this helps and is right! p.s. i really need brainliest :)

3 0

2 years ago

THERE WAS A HALF CLASS OF WATER IN A FRACTION HOW MUCH WATER WOULD 3 PEOPLE GET?

kkurt [141]

Answer:

0.16

Step-by-step explanation:

you divide 1/2 by 3 to 0.16666666 but it would recuce to 0.16

6 0

2 years ago