4 years ago

These figures are similar. The area of one is given. Find the area of the other.

Mathematics

1 answer:

lilavasa [31]4 years ago

7 0

Answer:

100 in^2

Step-by-step explanation:

(15/21)^2 x 196 = 100

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Answer:

20 coins?

Step-by-step explanation:

301 divided by 15??

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Prove the identity cos(x-y)-cos(x+y)=2sinxsiny

tekilochka [14]

Answer:

see the procedure

Step-by-step explanation:

we know that

$cos(X - Y) = cosX cosY + sinX sinY\\cos(X + Y) = cosX cosY - sinX sinY$

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$cos(X - Y)-cos(X + Y)=cosX cosY + sinX sinY-cosX cosY + sinX sinY$

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3 years ago

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Step-by-step explanation:

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3 years ago

State if each triangle is a right triangle

erik [133]

Answer:

16. No

18. Yes

20. Yes

Step-by-step explanation:

Because there is a right angle at at least one corner of the triangle.

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3 years ago

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Kaylis [27]

Answer:

x ∉ R

Step-by-step explanation:

x² = - 21

if x² < 0 => x ∉ R

8 0

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