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ella [17]
3 years ago
15

Hi I really need help on this problem. Thank you!

Mathematics
1 answer:
Olin [163]3 years ago
3 0

Answer:

The circumference of a circle with radius 13.8 is 86.71

Step-by-step explanation:

Circumference of a cicle in terms of radius:

Circumference = 2·π·r = 2·3.14·13.8 = 86.71

In terms of diameter:

Circumference = π·d = 3.14·27.6 = 86.66

In terms of area:

Circumference C = √4·π·A = √4·π·598.3 = 86.71

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A (DE = GF)

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In a isosceles trapezoid, one pair of segments are parallel, and another pair are equivalent in length.

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8.4 x -7.2 y which algebra expression is equivalent to the following expression
bekas [8.4K]

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Step-by-step explanation:

5 0
2 years ago
Question 13
Mrac [35]

Answer:

71.6 degrees

Step-by-step explanation:

Given the vectors

u= <8,4> v = <9.-9> (5 points)

u*v = (8, 4)*(9, -9)

u*v = 8(9)+(4)(-9)

u*v = 72 - 36

u*v = 36

|u| = √8²+4²

|u| = √64+16

|u| = √80

|v| = √9²+9²

|v|  = √81+81

|v|  = √162

Using the formula

u*v = ||u||v| cos theta

36 = √80(√162)cos theta

36 = √12960 cos theta

cos theta = 36/√12960

cos theta = 36/113.8

cos theta = 0.3162

theta = arccos(0.3162)

theta = 71.56 degrees

Hence the angle between the given vectors to the nearest tenth of a

degree is 71.6 degrees

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2 years ago
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