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kozerog [31]
2 years ago
6

Find the area of the square on this centimetre grid

Mathematics
1 answer:
Bess [88]2 years ago
6 0

Answer:

18

Step-by-step explanation:

the perfect square count as 1

the half square or the triangle count as half

then u got it bro

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Round to the nearest whole number: 123.45
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Answer:

123

Step-by-step explanation:

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PLEASEEE EXPLAIN AND HELP
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The length of the unknown sides of the triangles are as follows:

CD = 10√2

AC = 10√2

BC =  10

AB = 10

<h3>Triangle ACD</h3>

ΔACD is a right angle triangle. Therefore, Pythagoras theorem can be used to find the sides of the triangle.

  • c² = a² + b²

where

c = hypotenuse side = AD = 20

a and b are the other 2 legs

lets use trigonometric ratio to find CD,

cos 45 = adjacent / hypotenuse

cos 45 = CD / 20

CD = 1 / √2 × 20

CD = 20 / √2 = 20√2 / 2 = 10√2

20² - (10√2)² = AC²

400 - 100(2)  = AC²

AC² = 200

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<h3>Triangle ABC</h3>

ΔABC is a right angle triangle too. Therefore,

  • AB² + BC² = AC²

Using trigonometric ratio,

cos 45 = BC / 10√2

BC = 10√2 × cos 45

BC = 10√2 × 1 / √2

BC = 10√2 / √2 =  10

(10√2)² - 10² = AB²

200 - 100 = AB²

AB² = 100

AB = 10

learn more on triangles here: brainly.com/question/24304623?referrer=searchResults

5 0
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Answer:

Step-by-step explanation: does anyone know? I really need this

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None of the number lines show the same value
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