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Tom [10]
3 years ago
11

a chessboard has 64 squares at a chess tournament 84 were used how many squares are there on 84 chessboards

Mathematics
2 answers:
Bas_tet [7]3 years ago
7 0
5376 squares on 84 chessboards. You have to multiply 64 by 84
ddd [48]3 years ago
3 0
There are 84 squares on the chessboards
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GREYUIT [131]

Answer:

1/sqrt10

Step-by-step explanation:

1) Find out cosA using formula (cosA)^2+(sinA)^2=1

The module of cosA= sqrt (1- (-3/5)^2)= sqrt 16/25=4/5

So cosA=-4/5 or cosA=4/5.

Due to the condition 270degrees< A<360 degrees, 0<cosA<1 that's why cosA=4/5.

2) Find sinA/2 using a formula cosA= 1-2sinA/2*sinA/2 where cosA=4/5.

(sinA/2)^2= 0.1

sinA= sqrt 0.1= 1/ sqrt10 or sinA= - sqrt 0.1= -1/sqrt10

But 270°< A< 360°, then 270/2°<A/2<360/2°

135°<A/2<180°, so sinA/2 must be positive and the only correct answer is

sin A/2= 1/sqrt10

6 0
2 years ago
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Anastaziya [24]

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8 0
3 years ago
There is a ratio of 5 girls to 3 boys in the chorus. There are 24 boys in the chorus. How. many girls are in the chorus?
leva [86]

Answer:     40

Step-by-step explanation:

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Hope this helps :)

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Answer:

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Step-by-step explanation:

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luda_lava [24]

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<xpa=<apy

4 right angles are formed

2(xp)=xy

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Step-by-step explanation:

4 0
3 years ago
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