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The triangle ABC is such that AC=8cm, CB=12cm, angle ACB=x radians. The area of triangle ABC = 20cm^2. Show that x=0.430 (3sf)

From the equation of the area of a triangle, Area = 1/2 AC CB sin(C) 20 = 1/2 * 8 *12 * sin(x) => sin(x) = 0.416666... => x = 0.430 to 3sf
LD
Answered by Laura D. • Maths tutor
7641 Views

A bag contains 12 bals of different colours: 5 red, 4 blue and 3 yellow. What is the probability of not selecting a red ball

The probability of an event not happening is 1 minus the probability of the event happening. Five of the twelve balls are red so the probability of selecting a red ball is 5/12. The probability of not select...
LD
Answered by Laura D. • Maths tutor
9799 Views

How do I use PQA?

PQA stands for 'point, quote, analysis'. In a literary text, you may be asked to highlight the features which strenghten your essay's argument. To do so, it is best to first: 1) State the point you wish to m...
SF
Answered by Sophie F. • English tutor
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When would I use the conditionnel tense?

The conditionnel is used either as a form of politesse, to express a wish, to express a possibility, or an action completed with a condition.
SF
Answered by Sophie F. • French tutor
3270 Views

What does Avogadro's number mean?

Avogadro's number is simply used as a way of telling us how much of a substance we have. The number is 6.022 x 10 23 , and if we have that number of particles, we can make it easier by saying we have one mol...
KF
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