The specific steps are as follows
The surface of a cylinder can be divided into a rectangle and two circles. I think your teacher should have taught you.
The width of a rectangle is equal to the circumference of a circle, and the length is 10dm, so s rectangle =10 *18.84 =188.4dm?
Let's look at the circle again.
The circumference of a circle is 18.84dm, which can be obtained from C=2πr, r≈3.
Is the area of a circle πr? =3. 14*3? =28.26dm?
S cylinder =2*S circle +S rectangle =188.4+28.26 = 216.66 DM?
Cylinder volume:
The volume of a cylinder is equal to the bottom area multiplied by the height.
So V cylinder =S circle *h height =28.26* 10=282.6dm?
Surface area of cuboid:
The surface area of a cuboid is equal to the sum of the areas of six faces.
S cuboid =2*(3*8+3*4+4*8)= 136cm?
Volume of cuboid:
The volume of a cuboid is equal to the product of three sides.
So V cuboid =3*4*8=96cm?
Seek adoption