Given:
The radius of the circle = 13 dm
And an angle = 45 degree
Required:
To Calculate the areas of the base of the cone, the side surface, and the whole surface.
Explanation:
The base of the cone is a circle and the area of the circle is given by the formula:
The given triangle is the right triangle so to find the side surface use the following trigonometric identity:
Let the side of the surface = l dm
The total surface area of the cone is given by the formula:
Where r= radius of the base
l = slant height
Thus the total surface area
Final Answer:
Area of base =
Side of surface l =
The total surface area of the cone