Materials
It's an alloy of iron and coal.
What is steel?
The mathematical operation that is the opposite of division
What is multiplication?
Rocks from which metal could be extracted.
What is ore?
The angle that is less than 90 degrees
What is accurate angle?
A light metal that is used in aircraft production.
What is aluminium?
Total length of the boundary of a circle
What is circumference?
Wood obtained from trees that have leaves.
What is hardwood?
Two lines that intersect at a right angle
What is perpendicular?
A dense, poisonous metal.
What is lead?
Triangle that has two sides of equal length.
What is isosceles triangle?