Lampshade

The cone-shaped lampshade has a diameter of 30 cm and a height of 10 cm. How many cm² of material will we need when we 10% is waste?

Your answer:

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You need to know the following knowledge to solve this word math problem:

algebra
expression of a variable from the formula
solid geometry
cone
planimetrics
Pythagorean theorem
right triangle
area of the shape
triangle
basic functions
percentages
units
area
8th grade (13y)
9th grade (14y)

We encourage you to watch this tutorial video on this math problem: video1 video2