1. ## math problem!!

using V= TTr2h, find the volume of a cylinder with a diameter of 18 cm and a height of 2.5 cm. round to the nearest tenth..

a. 70.7 cm3 c. 141.4 cm3
b. 636.2 cm3 d. 2544.7 cm3

2. The volume of a cylinder is just the area of one of its end (a circle) multiplied by the height. With the area of a circle being given by :

$A = \pi r^2$ or by $A = \frac{{\pi d^2 }}{4}$
than you volume with by Area by height. ie

$V = \pi r^2 h$ or $V = \frac{{\pi d^2 }}{4}h$

the radius of a circle is just half of its diameter.

diameter = 18cm therefore radius = 1/2 * 18 = 9cm
your height is given as 2.5cm

Therefore you work your volume out as below

$V = \pi \times 9^2 \times 2.5 = \pi \times 81 \times 2.5 = 636.17^3$

Accuracy to 1/10th just means to 1 decimal place ie because answer is 636.1725124.... accurate to 1/10th or 1 decimal place will be to round up giving answer as 636.2

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# formula ttr2h?

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