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Why do angles in a triangle add to 180?

We know that angles on a straight line add to 180 degrees. Now imagine you have a triangle and the angles are called A, B and C. We can orientate the triangles so that we form a straight line. We can see tha...
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Answered by Aaran K. • Maths tutor
3829 Views

Using the quadratic formula factorise 2x^2 + 7x + 11 =0

Using the substitutions a=2, b=7 and c=11 with the quadratic formula we get two values of x at 3.39 and 0.89.
EA
Answered by Emily A. • Maths tutor
6945 Views

What is the area of a circle with a diameter of 3cm? (To 2 d.p.)

= pi * r^2 =pi * 1.5^2 =pi * 1.5 * 1.5 =7.07 cm^2
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Answered by Lavin A. • Maths tutor
3684 Views

Solve the simultaneous equations 3x + 2y = 4, 4x + 5y = 17

X = -2 Y = 5
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Answered by Tahira K. • Maths tutor
4493 Views

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Common exam question: fully expand and simplify (x+3)(x-2) Student asks: how should I best answer the question? How do I do it step by step? My answer: First expand each individual part of the brackets separ...
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Answered by Michael R. • Maths tutor
7555 Views