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Dominik [7]
3 years ago
9

Pls help me to find IK!

Mathematics
1 answer:
docker41 [41]3 years ago
3 0

Answer:

30

Step-by-step explanation:

31-12=19

49-19=30

Good Luck?!

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(High points) please solve with explanation
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The area and the perimeter of the picture are:

  • <u>Area = 160 cm^2</u>
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Step-by-step explanation:

To find the area of that figure, you can find the area how if it was a rectangle and next subtract the area of the triangle in the upper part. The area of a rectangle could be found by the next formula:

  • Area of a rectangle = base * height

As you can see in the picture, the base is 16 cm and the height is 12 cm, then we replace in the formula:

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Now, we calculate the area of the triangle to subtract to the area we found and obtain the real area, the formula to obtain the area of a triangle is:

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The height of the triangle is 8 cm, and the base is 8 cm too, because you subtract to the base of the rectangle (16 cm) the measurements in the upper part (16 - 4 - 4 = 8), Now, we replace in the formula:

  • Area of a triangle = (8 cm * 8 cm) / 2
  • Area of a triangle = (64 cm^2) / 2
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We subtract to the found area:

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To find the perimeter, you must add all the sides of the picture, but, as you can see, there is a side that doesn't have the measurent, this is the hypotenuse of the triangle used before, but how we know the other sides, we can use Pythagorean theorem:

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Where:

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  • b = Adjacent leg (8 cm)

So, we replace in the theorem:

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  • (8 cm)^{2}+(8cm)^{2}=c^{2} (and we clear c)
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At last, we add all the sides of the picture begining by the base and going by the left side:

  • Perimeter of the picture = 16 cm + 12 cm + 4 cm + 11.31 cm + 8 cm + 4 cm + 12 cm
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