Top answers
Maths
GCSE
PQRS is a parallelogram with P->Q=a and P->S=b. Find S->Q in terms of a and b. N is a point between S and Q, where SN:NQ is 3:2, find N->R
Vectors are special in that they have a direction as well as magnitude (size).
To get from S->Q you can go from S->P = -b and then P->Q =a so S->Q = -b + a = a
A semicircle has a diameter of 8cm, what it the area?
Area of a circle = pi × r2
Area of semi-circle = 1/2(Area of circle)
= 1/2(pi × r2)
Diameter = 2r
r = 8÷2 = 4
Area of semi-circle = 1/2(pi × 4
