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Edexcel 2017, Q8) A square, with sides of length x cm, is inside a circle. Each vertex of the square is on the circumference of the circle. The area of the circle is 49cm. Work out x.

First we should draw what the question tells us. Draws circle with square inside it We want to find out some extra information about the circle based on what we have been told. How can we do this?Well we kno...
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Answered by Alex B. • Maths tutor
8239 Views

Why does tanx = sinx/cosx ?

This identity can easily be shown by asking the student to draw a right-angled triangle, with one of the remaing two angles labelled x, and labelling the respective oppposite, adjacent and hypotenuse sides O...
SR
16944 Views

How do I know when to use avoir and when to use être in the passé composé - the perfect tense?

The passé composé - the perfect tense - is used for talking about completed events in the past, such as 'I bought an apple', and it is formed using an auxiliary verb the present tense and a past participle. ...
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Answered by Isobel M. • French tutor
3347 Views

Give two differences between a plant and animal cell

Answers are any 2 of the following: 1) plant cells have a cell wall whereas animal cells do not2) plant cells have vacuoles whereas animal cells do not3) plant cells have chloroplasts whereas animal cells do...
SJ
Answered by Sarah J. • Biology tutor
3141 Views

How can potable water be produced from salt water

The process in which salt is removed from salt water to produce drinkable water is called desalination. There are two major mechanisms that humans use to achieve this: thermal desalination, or distillation, ...
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Answered by William B. • Biology tutor
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