3 years ago

How do you find the radius of a cylinder when you only know the surface area?

1 answer:

7 0

The surface area of a cylinder with circular bases of radius r and height h is equal to the sum of the areas of the two circular faces and the area of the rectangular lateral surface:

A = 2πr² + 2πrh

If you know the height h, then you can solve the quadratic equation for r.

You might be interested in

Idk what I'm doing please help

Sonbull [250]

Answer:

776

Step-by-step explanation:

5 0

3 years ago

What are the coordinates of the center of a circle whose equation is (x + 7)2 + (y – 5)2 = 16?

Dafna11 [192]

Hi there! The answer is ( - 7, 5)

The standard form of the equation of a circle is the following:
$(x - a) {}^{2} + (y - b) {}^{2} = r {}^{2}$

In this equation r represents the radius of the circle and the point (a, b) is its centre.

Therefore, the centre of the circle
$(x + 7) {}^{2} + (y - 5) {}^{2} = 16$
is the point ( - 7, 5).

6 0

3 years ago

Evaluate 8y when y=4

earnstyle [38]

32 cause it’s 32 it be 32 boo

3 0

3 years ago

One angle of a right triangle measures 70 degrees. What is the other acute angle?

Sunny_sXe [5.5K]

Answer:

20 degrees

Step-by-step explanation:

A triangle's angles should 180 degrees added together, so 90 + 70 = 160, leaving 20 for the last angle.

4 0

3 years ago

hamburgers cost $2 per lbs and chicken costs $3 lbs and you only have $30 to spend and expect At least 3lbs of hamburger

kicyunya [14]

If you want at least 3 pounds of hamburgers, then $6 is enough to buy those 3 pounds of hamburgers. If you ONLY buy 3 Pounds, then you also have enough for 4 pounds of chicken. $3 a pound x 4 = $12. You have 2 dollars left to spare, which means you can buy another pound of hamburgers. So 4 pounds each are able to be purchased.

4 0

3 years ago