Find the radius of the right cylinder shown in which the hei

Find the radius of the right cylinder shown, in which the height of the cylinder is equal to its diameter _______ The lateral area of the right regular triangular prism is 18 cm^2 Find the total surface area. Give your answer in decimal form rounded to 2 decimal places triangle. ________ Find the surface area and volume of a tetrahedron with 2 in. edges.

Solution

8. The area of cylciner is 2pirh +2*pi*r^2 = 150pi

Therefore 2rh+2r^2 = 150

6r^2 = 150

r^2 = 25

r = 5