What is the length of a if a triangle has lengths of b=6.4cm and c=5.6cm with an angle A=107.9 degrees?
We are going to have to use the cosine rule for this type of question. The cosine rule is a2=b2+c2 - 2bcCosATherefore a2= (6.46.4) + (5.65.6) - (26.45.6)*Cos107.9 If we plug this into our calculator we will get a2= 94.3513...Then we square root a2 to get 9.7cm (1.d.p) - because all other values in the question are rounded up to 1 decimal place.
MK
Related Maths GCSE answers
All answers ▸Solve the following simultaneous equation: y= x^2 - 3x + 4 y - x = 1
Expand the quadratic equation and simplify: (3a+4)(a-1)
Sam uses 140g of flour to make 12 cakes. How much flour will Sam need to make 21 cakes?
Find the roots of 2x^2-2x=3, leaving your answer in it's simplest exact form.