Find the total surface area of this cone. Leave your answer in terms of 7.
15in
12 in
SA = [?] in
in2
Hint: Surface Area of a Cone = tre + B
Where e = slant height, and B = area of the base
Enter

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

all the angles opposite to the angle 150 would be 150 and all the angles that are next to 150 are 30 because they equal 180 it you add it up.

step-by-step explanation: