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MakcuM [25]
3 years ago
10

The diameter of a circle is 8 cm. What is the area of the circle? Use 3.14 for pi

Mathematics
1 answer:
pogonyaev3 years ago
4 0

Answer:

50.27

Step-by-step explanation:

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Find the total number of diagonals for a polygon of 10 sides.
Ugo [173]
Diagonals = n(n-3)/n where n is the number of sides

if a polygon have 10 sides
= 10(10-3)/10
= 7

thus, the polygon have 7 diagonals.
7 0
3 years ago
In triangle ABC angle C 105° B 45° BD median of triangle ABC find the angle bdc
antiseptic1488 [7]

Answer:

30

Step-by-step explanation:

105 + 45 +  bdc = 180

bdc=30

8 0
1 year ago
There are 8 tennis players in a round robin tournament, which means each team will play every other team once. How many matches
Aliun [14]
<h3>Answer:  28</h3>

==========================================================

Explanation:

Method 1

Imagine a table with 8 rows and 8 columns to represent all possible match-ups. You can actually draw out this table or just think of it as a thought experiment.

There are 8*8 = 64 entries in the table. Along the northwest diagonal, we have each team pair up with itself. This is of course silly and impossible. We cross off this entire diagonal so we drop to 64-8 = 56 entries.

Then notice that the lower left corner is a mirror copy of the upper right corner. A match-up like AB is the same as BA. So we must divide by 2 to get 56/2 = 28 different matches.

----------------------------------

Method 2

There are 8 selections for the first slot, and 8-1 = 7 selections for the second slot. We have 8*7 = 56 permutations and 56/2 = 28 combinations.

----------------------------------

Method 3

Use the nCr combination formula with n = 8 and r = 2

n C r = \frac{n!}{r!(n-r)!}\\\\8 C 2 = \frac{8!}{2!*(8-2)!}\\\\8 C 2 = \frac{8!}{2!*6!}\\\\8 C 2 = \frac{8*7*6!}{2!*6!}\\\\ 8 C 2 = \frac{8*7}{2!}\\\\ 8 C 2 = \frac{8*7}{2*1}\\\\ 8 C 2 = \frac{56}{2}\\\\ 8 C 2 = 28\\\\

There are 28 combinations possible. Order doesn't matter (eg: match-up AB is the same as match-up BA).

Notice how the (8*7)/2 expression is part of the steps shown above in the nCr formula.

7 0
2 years ago
42:11
antiseptic1488 [7]

Answer: The y intercept is -7  or (0,-7)

Step-by-step explanation:

First convert the equation into slope intercept form .

y - 3 = -2(x + 5)    Multiply on the right side

y -3 = -2x - 10           Add 3 to both sides

+3             +3

y = -2x - 7  

In this case the y intercept is -7 and it is when x is zero.

5 0
3 years ago
The measure of the angle with "?" is what?
Sergeeva-Olga [200]

Answer:

? =  116°

Step-by-step explanation:

when a line passes through 2 parallel lines,

the angles ?° + 64° are complementary or add up to 180°

? + 64° = 180°

? = 180° - 64° = 116°

4 0
3 years ago
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