3 years ago

WILL GIVE THE BRAINLEST PLZ HELP WITH 8 AND 10SHOW WORK

Mathematics

1 answer:

kkurt [141]3 years ago

7 0

Because it's a right angle, you can determine that Angle ABC and Angle CBD=90 degrees. Therefore:

(2x+1)+33=90

2x+1=57

2x=56

x=28

Due to one of the postulates, or whatever (haven't done geometry in 2 yrs, forgive me), angles GJH and FJI are equal to each other. Therefore:

5x+12=6x-10

-x=-22

x=22

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What is the approximate surface area of a sphere with a circumference of 37.68

sergij07 [2.7K]

We must find the radius so we can plug this into the formula for surface area.

Circumference = $2 \pi r$
$37.68 = 2 \pi r \\ r = 37.68/2 \pi$

We are going to plug this in as our radius for the most accurate answer.

The surface area of a sphere is $4 \pi r^{2}$

Surface Area = $4 \pi ( \frac{37.68}{2 \pi }) ^{2}$ ≈ 451.93 units