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ABC are points on a circle, centre O. AO=9cm, OC=9cm and AC=15cm. Find the angle ABC.

Diagrams would be used to help visualise the answer. To find the angle OAC, the cosine rule needs to be used: cosA = (b 2 + c 2 - a 2 )/2bc. Therefore, looking at the diagram, (15 2 + 9 2 - 9 2 )/2x15x9 = co...
IP
Answered by Imogen P. • Maths tutor
4533 Views

Beschreiben Sie Ihr zukünftiges Traumhaus

Wenn ich an mein zukünftiges Traumhaus denke, denke ich an ein großartiges Haus mit Balkon, Schwimmbad und meinem eigenen Kino! In meinem Haus würde ich mit meiner Familie und meinem Hund wohnen, da ohne ihn...
LD
Answered by Lucia D. • German tutor
6944 Views

What do I do when quadratic equations aren't written in the standard format ax^2 + bx + c = 0 ?

This isn't a trick so much as a way to let you show you can think for yourself. You might be thrown off initially if a quadratic equation is in a format that you don't recognise, but usually all it takes is ...
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Answered by Helena K. • Maths tutor
5205 Views

How do I use the extracts in the source booklet in my answers?

GCSE History is great because it lets you work like a real life historian, examining evidence from the past and weighing it up! The Sources paper is an important part of this, and it lets you show off your a...
HK
Answered by Helena K. • History tutor
3448 Views

What is an alkene and how might one be identified?

Alkenes are a family of hydrocarbons (compounds made up of only hydrogen and carbon atoms) that all share the same chemical formula, similar chemical properties (due to same functional group) and trends in p...
NC
Answered by Natasha C. • Chemistry tutor
7348 Views