radius of the circle is 20 cm (you really need to have a look at the definition of a radius)
total height = height of the wall + diameter of the circle
Sophie built a small tower, made of bricks, in her back garden. On top of it she fitted a large glass light-bulb holder.
The diagram shows it as part of a circle.
Centre, C, is 20 centimetres above the top of the wall.
1. Calculate the radius of the circular bulb holder.
2. Use this to find the total height of the structure.
Here's the diagram :
Just to let you guys know : I know what the radius is (half the diameter of a circle), but my teacher said it's an exam question and I'm in the highest maths class. How the heck can it be that easy?
Well, it's obvious to me that the line shown as 22 is really 20;
that makes radius = sqrt(15^2 + 20^2) = 25.
So height = 55 + 20 + 25 = 100.
All in favor raise your hands !!