What use is a quadratic equation? A quadratic equation is an equation where at least one term is squared. It looks something like this: ax² + bx + c or c = ax² + bx .. and students are asked to solve, factorise or draw it. Quadratics are usually the most dreaded of homework assignments. I'm sure many students have wondered about their use. Will they ever be useful - or is a … [Read more...]
How to work out the volume of a cone and hemisphere
How to work out the volume of a cone and hemisphere - or an ice cream! These are really higher level grade A / B GCSE questions but: - the formulas are given on the exam paper (although you should learn them :-)) and - if you work through logically it should be straightforward. The questions usually involve calculating a volume of a cone, sphere or hemisphere. There might … [Read more...]
How to use sin, cos and tan to find the length of a missing side in a right angle triangle
How to use sin, cos and tan continues... .. with a video on finding the missing length in a right angle triangle. Watch the video and try the quick test. Click here to try the Quick Test SohCahToa As before you can use SOHCAHTOA to calculate, although, in this case, you'll need to: know the length of one side know the size of one of the acute angles A typical exam … [Read more...]
Why and how to work out the volume of a cylinder
How to work out the volume of a cylinder is typically a grade C GCSE question.. GCSE Grade C question to calculate the volume of a cylinder with a radius of 3cm and a height of 4cm. How to work out the volume of a can of coke. Just a quick video to calculate if 330ml is accurate. It is... but my estimation shows 380ml ! I've not allowed for the coke can design and not … [Read more...]